Answer:
Explanation:
Deforestation is a precursor to desertification. A desert is an extremely arid region with little to no rainfall. How does this happen?
Plants contributes a significant proportion of water to the water cycle. During transpiration, water evaporates from the body parts of a plant and this water goes to the atmosphere. The water cools and condenses to form precipitation
When forests are removed, this significant proportion of the water cycle is lost. The water from plants would no longer be available for precipitation. Such an area will suffer drastic changes in the amount of precipitation it receives.
Answer:
It increases the amount of runoff
Explanation:
Mitochondrial presequences are ____ charged amphipathic sequences retained in the ____ stage through association with ____ molecular chaperones.
A. negatively; folded; Hsp70
B. positively; unfolded; Hsp70
C. neutral; unfolded; Hsp40
D. negatively; prefolded; Hsp90
E. positively; folded; Hsp40
Answer:
E. positively; folded; Hsp40
Explanation:
Which of the following substances is not normally found in filtrate?
a. water and small solutes
b. blood cells and large particles
c. ions, such as sodium and potassium
d. nitrogenous waste particles, such as
urea
Answer: B
Explanation:
Blood cells are typically too large to pass through the glomerular filtration membrane. However if they do, this can be indicative of problems with the filtrate.
Answer: blood cells and large particles.
Explanation:
Filtrate is the fluid that is filtered from the blood which pass through the nephron. When blood flows from the nephron, it enter the Bowman's capsule of the glomerulus. The tiny walls of the glomerulus can only allow the passage of small particles or is not selectively permeable to small particles such as water, ions ,sodium, potassium, nitrogenous wastes. Larger molecules and blood cells stay in the blood vessels because they cannot pass through the tiny walls
The mechanism of contraction in smooth muscle is different from skeletal muscle in that ________. A. ATP energizes the sliding process B. the site of calcium regulation differs C. the trigger for contraction is a rise in intracellular calcium D. actin and myosin interact by the sliding filament mechanism
Explanation:
D. actin and myosin interact by the sliding filament mechanism.
Answer: B. The site of calcium regulation differs.
Explanation:
Smooth muscle is an involuntary muscle. It is a form of non-striated muscle. It is present as the lining over the hollow organs such as stomach, urinary bladder, uterus, arteries, veins, respiratory and reproductive structures.
Skeletal muscle is a voluntary muscle which is actually under the control of the brain. It is a form of striated muscle. It helps in contraction of the muscles and facilitates the locomotion of the body.
The source of calcium for the contraction of the skeletal muscles is the sarcoplasmic reticulum which stores the intracellular calcium.
There are two sources of calcium for the contraction of the smooth muscles these are:
1. The sarcoplasmic reticulum which stores the intracellular calcium.
2. The calcium channels which are present over the cell membrane which stores the extracellular calcium.
A large population of mice (2000 individuals) lives in an area dominated by small shrubs in the desert. When the population size got too high, a small group of 6 individuals left and colonized an area adjacent to the original population's home, but this area is primarily dominated by trees instead of shrubs. There is no gene flow between the dispersers and the original population. A researcher sequenced the genomes of representative individuals from both populations and found substantial genetic differences between them. Which of the following would MOST account for the amount of genetic differences observed?
Divergence between the two populations was caused solely by drift.
Since the original dispersal event, the small population will have evolved more than the large population.
Divergence between the two groups is high because of gene flow between them.
The divergence between populations could only have been caused by stabilizing selection.
Answer:
Since the original dispersal event, the small population will have evolved more than the large population
Explanation:
When the group of 6 individuals left and colonized an area that was different to their initial home, they had to adapt to the new environment and new food resources. Offspring from the small population that had more advantageous characteristics had a better chance of survival than those that did not.
The offspring that had the better chance of survival were the ones that inherited new traits that helped survive in their environment with more trees and thus they would breed with other mice that also survived, passing on these traits to their offspring. The mice that did not inherit these traits, could not survive well and probably died.
The mice from the original population did not need to inherit as many new traits as they were in a familiar environment and thus did not evolve as much as the smaller population.
The genetic divergence observed between the two mouse populations is most likely accounted for by a combination of genetic drift, due to the small size of the dispersed group, and natural selection, due to the differing environments.
Explanation:The genetic differences observed between the two populations of mice are most likely due to a combination of genetic drift and natural selection. The initial genetic divergence of the small group of 6 individuals that separated from the larger population could have been influenced by genetic drift. Because this group is very small, it is highly susceptible to the effects of genetic drift, which can lead to large changes in allele frequencies over time. In other words, random changes in the gene pool of this small population can cause certain traits to become more or less common purely by chance.
On top of random genetic drift, it's also a solid bet that there's been some natural selection happening. Given that the small group moved into a new area dominated by trees instead of shrubs, different attributes would be helpful for survival and reproduction. Those mice that possessed favorable traits for this new tree-dominated environment would have a better chance of surviving and passing these traits to their offspring, leading to natural selection.
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Which of the following mechanisms is NOT used to propel lymph through lymphatic vessels? A. gravity B. small heart-like pumps C. the milking action of muscles D. pulmonary motion
Answer:
B. small heart-like pumps
Explanation:
Small heart-like pumps is a mechanism that is NOT used to propel lymphs through lymphatic vessels.
The lymphatic system uses gravity, muscle contractions, and breathing to move lymph through the vessels. It does not use small heart-like pumps. The heart's pumping action, by contrast, is essential to the functioning of the venous system.
Explanation:The lymphatic system propels lymph through the lymph vessels via various mechanisms. These mechanisms include the contraction of skeletal muscles during body movements, the process of breathing, and the force provided by gravity, all of which aid in moving lymph toward the heart. The lymphatic system does not, however, contain small heart-like pumps. The statement 'B. small heart-like pumps' therefore represents the mechanism not used to propel lymph through lymphatic vessels.
One key difference between the cardiovascular and lymphatic systems is that lymph is not actively pumped by the heart. Instead, it moves through the vessels due to body movements, the contraction of skeletal muscles, gravity, and breathing. These mechanisms help keep lymph moving in one direction—toward the heart—thanks to the action of one-way semi-lunar valves in the lymphatic vessels.
In contrast to the lymphatic system, the venous system relies on the heart's pumping action to move blood from areas of higher pressure to areas of lower pressure.
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If a keystone species is removed from an ecosystem,
a. only abiotic factors can be affected.
b. only biotic factors can be affected.
c. neither abiotic nor biotic factors can be affected.
d. abiotic and biotic factors can be affected.
Answer: D. abiotic and biotic factors can be affected.
If a keystone species is removed from an ecosystem, both abiotic and biotic factors can be affected, which is option d, as keystone species play a crucial role in maintaining the balance of an ecosystem. Their removal can have significant impacts on the ecosystem as a whole, affecting both biotic and abiotic factors.
What is a keystone species?If a keystone species is removed from an ecosystem, both abiotic and biotic factors can be affected. Keystone species are species that have a disproportionately large effect on the structure and function of their ecosystem, despite their low biomass or population. They play critical roles in maintaining biodiversity and ecological balance. When a keystone species is removed, it can cause a ripple effect throughout the entire ecosystem.
Hence, if a keystone species is removed from an ecosystem, both abiotic and biotic factors can be affected, which is option d, as keystone species play a crucial role in maintaining the balance of an ecosystem. Their removal can have significant impacts on the ecosystem as a whole, affecting both biotic and abiotic factors.
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In the amber deposits along the Baltic Sea, scientists were amazed to find insects from every region of the earth. Develop a hypothesis that may explain their findings.
The amber in the Baltic Sea has exposed insects from every region of the planet trapped in it. This can be a nice evidence about the continental drift theory. The continents have been moving for billions of years now. While they are not merged today, an we have multiple separate continents, that has not always been the case. In the past, the continents have all been merged into one enormous landmass, a supercontinent. The name given tot his supercontinent is Pangaea. Since all the continents were merged, thus representing one continuous land mass, the living organisms were able to move all throughout it, including the species of insects as well. As the movement was free, the amber in what is now the Baltic Sea, managed to preserve insects numerous different species of insects, which later, as Pangaea started to break apart, were separated and lived in different land masses as they got isolated from each other.
Explain why the jet stream looks so different in picture one and picture two. Please refer to the tutorial to answer this question. Please answer using complete sentences.
Answer:
Picture one is an illustration of the jet stream on the northern hemisphere during summer. In the tutorial it states, the temperature contrast between cold and warm air masses are smaller, so the jet stream is not that strong only travelling at 50-70 mph. Picture two is an illustration of the jet stream on the northern hemisphere during winter. In the tutorial it states the temperature contrast between cold and warm air masses are greater, so the jet stream is very strong travelling at 90-160 mph.
Explanation:
The northern hemisphere's summer jet stream is depicted in figure one. According to the lesson, because there is little to no temperature difference between the warm and cold air masses, the jet stream only moves at 50 to 70 miles per hour, making it weaker. Picture two shows the northern hemisphere's jet stream during the winter. According to the lesson, because the temperature changes between cold and warm air masses are bigger, the jet stream is very powerful and moves at speeds between 90 and 160 mph.
What is hemisphere?The region of Earth of the Equator is called as the Hemisphere. It contains all or a portion of all five continents (Antarctica, Australia, approximatly 90% of South America, nearly one-third of Africa, and some islands off the continental main island of Asia), all four oceans (the Indian Ocean, South Atlantic, Southern Ocean, and South Pacific Ocean), as well as Nz and the majority of the Pacific Islands in Oceania.
Compared to the Hemisphere, its surface is made up of 80.9 percent water, with 32.7 percent of the planet's landmass. Winter lasts from June to August, while summer lasts from Dec to Feb (inclusive) due to the tilt of the Earth's rotation in relation to the Sun and ecliptic plane (inclusive).
What is temperature?A measure of the typical kinetic energy of the atoms or molecules in a system, temperature is a physical variable that conveys hot and cold. The source of heat, the movement of energy from a hotter body in contact with a colder body, is the expression of thermal energy, which is a component of all matter.
A thermometer is used to measure temperature, which is then calibrated using different temperature scales that historically employed different reference points and thermometric substances for definition. The most popular scales are the Celsius scale, originally known as "centigrade," denoted by °C, the Fahrenheit scale, denoted by °F, and the Kelvin scale, denoted by K, with the latter being mostly used for scientific purposes under norms of the.
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You see a white marker with an orange circle and black lettering. what does this marker tell you
Answer:
Controlled area
Explanation:
A white marker with an orange circle and black lettering indicate a controlled area which may represent a speed limit, wake restrictions or anchoring.These markers are regulatory markers that are present to make the boaters aware of the dangers and their surroundings. These markers help in navigation.A white marker with an orange circle and black lettering usually signifies an information or instruction sign in public or recreational areas in the US. The specific message depends on the text in the black lettering.
Explanation:When you see a marker with an orange circle and black lettering, it typically signifies a particular type of information or instruction. In the United States, this type of marker is often used for informational signs or notices in recreational or public areas. It can give instructions, provide information about the area, or serve as a warning. The specific information conveyed depends on the text included in the black lettering.
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Which statement(s) correctly describe(s) the role of hormones in calcium metabolism? Be aware that all statements may be correct. Which statement(s) correctly describe(s) the role of hormones in calcium metabolism? Be aware that all statements may be correct. Intestinal absorption of calcium depends on the level of active vitamin A that we have in our body. Parathyroid hormone and calcitonin stimulate calcium reabsorption by the kidneys. Calcitonin is released when blood calcium levels are high and increases the activity of osteoclast cells in bone, releasing calcium from bone into the blood. Parathyroid hormone is released when dietary calcium levels are low.
Answer:
Parathyroid hormone is released when dietary calcium levels are low.
Explanation:
Parathyroid hormone is considered to be a vital hormone involved in regulating the calcium levels of the body. The hormone is secreted by parathyroid glands which are located behind thyroid glands in neck region. This hormone regulates the calcium level of the body by putting its action through bones, intestine and kidneys.
In actual there is a negative feedback system in the body through which parathyroid levels are controlled. When calcium levels in the blood get very low, the gland is stimulated to secrete more parathyroid hormone while when calcium is very high in the blood, it prevent the release of parathyroid hormone.
Hope it helps!
Hormones, primarily parathyroid hormone and calcitonin, play a crucial role in calcium metabolism, helping to maintain balance in the body. Their activities stimulate the release or uptake of calcium from the bones, promote calcium absorption from the intestines, and regulate calcium reabsorption at the kidneys.
Explanation:The role of hormones in calcium metabolism is primarily regulated by parathyroid hormone (PTH) and calcitonin. These hormones maintain calcium balance in our body, with PTH being generated in response to low blood calcium levels, and calcitonin being released when high calcium levels are sensed. PTH stimulates the integer absorption of calcium, reabsorption of calcium by the kidneys, and promotes the activity of cells called osteoclasts to release calcium from the bones. Conversely, calcitonin reduces calcium levels in the blood by inhibiting osteoclast activity and stimulating calcium uptake by the bones.
Under the influence of PTH, vitamin D is synthesized, which plays a significant role in facilitating the absorption of dietary calcium indirectly. Intestinal absorption of calcium does not depend on active vitamin A but on active vitamin D levels in the body. Hence, the statement about vitamin A is incorrect. Therefore, the correct statements include the roles of parathyroid hormone (PTH) and calcitonin in calcium absorption, reabsorption, and regulation in the body.
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Match the description of the marine organism's lifestyle with the correct term.
1.epifauna
2.holoplankton
3.meroplankton
4.nekton
5.infauna
(A) can never swim against a current
(B) lives on top of benthic sediments
(C) swims for its entire life
The correct answers are:
epifauna - lives on top of benthic sediments
holoplankton - swims for its entire life
meroplankton - can never swim against a current
nekton - swims actively against currents
infauna - lives within benthic sediments
What are marine organisms?Marine organisms are organisms that live in the marine environment, which includes oceans, seas, and other bodies of saltwater. The marine environment is home to a diverse range of organisms, including fish, shellfish, coral, seaweed, plankton, and many other types of plants and animals. These organisms play important roles in the functioning of the marine ecosystem, and many of them are important sources of food for other animals, including humans.
The marine environment is also home to a wide variety of ecosystems, including coral reefs, kelp forests, and deep-sea hydrothermal vents, each with its own unique community of marine organisms.
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The adrenal medulla secretes epinephrine during sympathetic stimulation. Why epinephrine would increase the sympathetic response?
Answer: Because epinephrine activates the fight or flight response, related to the sympathethic response in the body.
Explanation:
The function of the Autonomic Nervous System is the regulation of the system cardiovascular, digestion, respiration, body temperature, metabolism, exocrine glands, and therefore keep the internal environment constant (homeostasis). While sympathetic activity increases in stress, the activity parasympathetic predominates during rest and satiety. The adrenal medulla originates from the neural crest and is composed of neuroendocrine specialized cells and are responsible for the production of catecholamines.
Catecholamines are dopamine, adrenaline, and noradrenaline (epinephrine and norepinephrine). Epinephrine prepares muscles, lungs, and heart for more intense activity, in situations of stress. It promotes the increase in the force of contraction in the muscles and increases in the heart rate. It also leads to increased blood pressure and bronchodilation, for greater availability of O2.
Test your knowledge about the specific functions of the five types of white blood cells
1. Release histamine, which promotes inflammation.
2. The cytoplasm is a thin ring around the nucleus.3. Contain cytoplasmic granules that stain bright red with eosin.4. The most common type of white blood cells. 5. Two- to four-lobed nuclei.
6. Enlarge and become macrophages which engulf foreign substances. 7. Contain large cytoplasmic granules that stain dark blue or purple with basic dyes.
Answer:
1. Release histamine, which promotes inflammation- basophils.
2. The cytoplasm is a thin ring around the nucleus- lymphocytes.
3. Contain cytoplasmic granules that stain bright red with eosin- eosinophils.
4. The most common type of white blood cells- neutrophils.
5. Two- to four-lobed nuclei- neutrophils.
6. Enlarge and become macrophages which engulf foreign substances- monocytes.
7. Contain large cytoplasmic granules that stain dark blue or purple with basic dyes- basophils.
Explanation:
White blood cells or WBC are the cells which provide the defence against pathogens so they are also known as the soldiers of the body. Five types of WBC are present in the body namely - neutrophils, eosinophils, monocytes, basophils and lymphocytes.
1. Neutrophils- They are the most abundant WBC in the blood in about 40% to 60%. These neutrophils are distinguished on the basis of lobes which are usually present in two to five.
2. Eosinophils- the cells which account for 1% to 4% of total WBC characterized by red-stained cytoplasmic granules and a bilobed nucleus.
3. Basophils- The cells characterized by a large blue -stained cytoplasmic granules. they act by producing heparin nd histamine in allergic reactions.
4. Lymphocytes- they are the smallest of all the WBC easily characterized by a spherical nucleus with very little cytoplasm.
5. Monocytes- the largest of all WBC with a kidney-shaped nucleus and abundant cytoplasm. They act by becoming macrophages and engulfing the pathogens and foreign material by a process called phagocytosis.
The five types of white blood cells are Neutrophils, Eosinophils, Basophils, Lymphocytes, and Monocytes. Each has different functions which include fighting infections, combating allergic reactions and parasites, releasing histamines to promote inflammation, producing antibodies, and repairing tissues.
Explanation:The specific functions of the five types of white blood cells are as follows:
Neutrophils: They are the most common type of white blood cells and their main function is to fight infection by engulfing foreign particles Eosinophils: They contain cytoplasmic granules that stain bright red with eosin, and are primarily involved in the immune response against parasitic infections and allergic reactions. Basophils: They release histamine, promoting inflammation, and contain large cytoplasmic granules that stain dark blue or purple with basic dyes. Lymphocytes: Their cytoplasm is a thin ring around the nucleus and they play a key role in producing antibodies and immunological memory. Monocytes: They have the ability to enlarge and become macrophages which engulf foreign substances and are crucial for tissue repair. Learn more about White Blood Cells here:https://brainly.com/question/24122064
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Which model is most likely used to show something that happens too slowly to see?a model of a weather systema model of mountain formationa model of the area of a circlea model of an architectural building
Answer:
a model of mountain formation ( second choice)
Answer:
The correct answer is a model of mountain formation.
Explanation:
A model signifies towards a demonstration of a process, an idea, or a system that is used to illustrate a particular procedure, which cannot be experienced straightforwardly. The models are generally used in science to illustrate various procedures. When one is speaking about an appropriate model to demonstrate an incident, which takes place gradually, the most likely choice from the mentioned options will be a model of mountain formation. This is due to the fact that the procedure of mountain formation takes place very gradually over an extended time duration.
Proteins that bind to cells and stimulate cell division are called
a. growth factors.
b. carcinogens.
c. kinases.
d. enzymes.
The answer to this question would be A:growth factors
Hope this helped!!
Proteins that bind to cells and stimulate cell division are called growth factors. Thus, the correct option for this question is A.
What do you mean by Cell division?Cell division may be defined as a biological process through which a parent cell divides into two daughter cells. There are two types of cell division. They are as follows:
Mitosis: A parental cell give rise to the production of two daughter cells which are genetically identical to the parental cell. Meiosis: A parental cell give rise to the production of four daughter cells which are genetically unique to the parental cell.Carcinogens are cancer-causing agents which stimulate the abnormal or excessive growth of cells in living organisms. Enzymes are biological catalysts that increase the rate of a chemical reaction without being involved in the overall process.
Kinases are the enzymes that significantly catalyze the transfer of a phosphate group from ATP to a specific molecule during a reaction.
Therefore, proteins that bind to cells and stimulate cell division are called growth factors. Thus, the correct option for this question is A.
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Plant cells can better tolerate exposure to hypotonic solutions than can animal cells. Which one of the following helps to best explain why plant cells can better tolerate hypotonic solutions? a. The hot sun on plant cells causes any extra water to evaporate. b. The rigid cell walls limit how far plant cells can expand and exert a back pressure to limit further water uptake. c. Chloroplasts consume the extra water in photosynthesis, decreasing the swelling. d. The veins in plants drain away the extra water from the plant cells. e. Stomata in plant cell leaves quickly drain excess water from the cells.
Answer:
b. The rigid cell walls limit how far plant cells can expand and exert a back pressure to limit further water uptake.
Explanation:
Plant cells have a rigid cell wall made of cellulose. Animal cells lack a cell wall.
When the plant cells are placed in a hypotonic solution, water enters into the cells and the cells expand. However, after a certain limit, the cell wall exerts wall pressure on the contents of the cell and does not allow it to take more water in. The wall pressure from the cell wall of plant cells protects them against bursting when placed in a hypotonic solution.
Animal cells burst out due to intake of water by osmosis when placed in a hypotonic solution. They do not have a cell wall to protect them from bursting.
A) Aortic semilunar valve B) Mitral (bicuspid) valve C) Tricuspid valve D) Pulmonary semilunar valve 1) Prevents backflow into the left ventricle. ----------------- 2) Prevents backflow into the right atrium. -------------------- 3) Prevents backflow into the left atrium. --------------------- 4) Prevents backflow into the right ventricle. ------------------------- 5) Atrioventricular (AV) valve with two flaps. ----------------- 6) Atrioventricular (AV) valve with three flaps. ------------------------
The aortic semilunar valve prevents backflow into the left ventricle, the tricuspid valve prevents backflow into the right atrium, and the mitral valve is an AV valve with two flaps that prevents backflow into the left atrium.
Explanation:The answer to the first question is A) Aortic semilunar valve. The aortic semilunar valve prevents backflow into the left ventricle.
For the second question, the correct answer is C) Tricuspid valve as it prevents backflow into the right atrium.
Lastly, the answer to the last question is B) Mitral (bicuspid) valve. It is an atrioventricular (AV) valve with two flaps that prevents backflow into the left atrium.
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The four main valves of the heart each serve to prevent backflow into different parts of the heart. They include the Aortic semilunar valve, Mitral or bicuspid valve, Tricuspid valve, and Pulmonary semilunar valve. The Mitral and Tricuspid valves are also classified as atrioventricular (AV) valves.
Explanation:The heart contains several key valves that regulate blood flow. These include the Aortic semilunar valve, Mitral (bicuspid) valve, Tricuspid valve, and Pulmonary semilunar valve. Each of these valves prevents backflow into different parts of the heart:
The Aortic semilunar valve (1) prevents backflow into the left ventricle. The Tricuspid valve (2) prevents backflow into the right atrium. The Mitral or bicuspid valve (3) prevents backflow into the left atrium. This valve is also categorized as an atrioventricular (AV) valve with two flaps (5). The Pulmonary semilunar valve (4) prevents backflow into the right ventricle. The Tricuspid valve, besides preventing backflow into the right atrium, is categorized as an atrioventricular (AV) valve with three flaps (6).
These valves ensure that blood flows efficiently and in the correct direction through the heart, supporting the process of double circulation in the mammalian cardiovascular system.
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Which statement about plant classification below is true?
A. No nonvascular plants bear seeds, but not all vascular plants bear seeds
B. Not all angiosperms produce flowers, but all gymnosperms produce cones.
C. Not all nonvascular plants bear seeds, but all vascular plants do bear seeds.
D. All vascular plants are angiosperms, but not all nonvascular plants are mosses.
Answer:
No nonvascular plants bear seeds, but not all vascular plants bear seeds (Ans A)
Explanation:
Vascular plants having a vascular system that includes phloem and xylem which are helping them to transport food , water and minerals to other parts of the plant. Examples of vascular plants are: Angiosperm (Seed producing plant), gymnosperm (Seed producing plant), Ferns (Non-seed plant), fern is the example of not all vascular plant bear seeds.
Non-vascular plants do not have a vascular system. They also lack true seed, leaves & flowers. Instead of roots they have rhizoids to absorb water and minerals. Examples of non-vascular plants are : Mosses , Liverworts & Hornworts.
Habitat isolation, in which two different species occupy different habitats (e.g. one lives in the forest canopy, while the other lives among the vines of a rain forest) is an example of a(n):
Answer:
Speciation
Explanation:
When two species live in different habitats is called ecological isolation or habitat isolation. The two species can interbreed but they are not likely to meet each other. For example one species occupy forest canopy, while the other lives among the vines of a rain forest. This is an example of prezygotic barrier of speciation.
Final answer:
Habitat isolation is a form of reproductive isolation where populations of a species live in non-overlapping habitats, leading to speciation through natural selection, mutation, and genetic drift.
Explanation:
Habitat Isolation as a Mechanism of Speciation
Habitat isolation occurs when populations of a species move to or are placed in a new habitat that does not overlap with the habitats of other populations of the same species. This form of reproductive isolation prevents individuals from different populations from mating, leading to genetic divergence over time. An excellent example of this is when a flood causes a cricket population to split, resulting in two groups that can no longer interbreed.
Over generations, the application of natural selection, combined with mutation and genetic drift, can lead to the emergence of new species as these isolated populations adapt to their specific environments. Notably, the process of speciation does not require large geographical distances; for instance, two species of crickets, Gryllus pennsylvanicus and Gryllus firmus, have evolved to occupy distinct soil types despite living in close proximity.
Which is a primary disturbance?
A. Tree falling
B. Volcanic eruption
C. Snow melting
D. Logging
Answer:
A volcanic eruption would be a primary disturbance, because it would affect the complete environment. The eruption would destroy all plants, and would most likely kill all organisms. After the volcanic eruption however, a second generation of organisms will move into the habitat.
Explanation:
Hope this helps!
The primary disturbance is a volcanic eruption. The correct option is B.
What is primary disturbance?In ecology, the primary disturbance is any disturbance that causes a temporary change in the environment. It changes and affects the biotic and abiotic factors of the environment.
Volcanic eruption is a primary disturbance because it causes earthquakes and destruct the areas nearby.
Thus, option B. Volcanic eruption is correct regarding a primary disturbance.
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true or false Proliferative retinopathy a diabetic microvascular disease represent the greatest threat to vision it is characterized by the proliferation of new blood vessels growing from the retina into the vitreous.
Answer:
True.
Explanation:
Proliferative retinopathy may be described as a medical condition in which the new and weak blood start to form on retina and restores the blood supply. This condition may also develop in diabetic patient.
This is a diabetic microvascular disease that can affect the physiology of eyes. The individual has the threat to vision because new blood vessels grows on retina from the vitreous.
Thus, the answer is true.
For each region of the lac operon on the F' plasmid, I+ P+ Oc Z− Y+ , determine whether the region is wild type (that is, it produces a functional protein or it's a correct protein binding sequence) or whether the region is mutated. Select all that apply :
(A) The promoter sequence is correct/functional.
(B) The repressor protein is produced.
(C) The operator sequence is correct/functional.
(D) Beta-galactosidase is produced from the lacZ gene.
(E) Permease is produced from the lacY gene.
Answer:
A,B and E
Explanation:
I+: I refers to the lac repressor, the + indicates that the repressor is functionalP+: P refers to the promoter region and the + indicates that the promoter is functionalOc: O refers to the operator region, but the Oc indicates that the operator is constitutive ie. that it is always on/ can't be turned off.Z-: Z refers to the LacZ gene which produces β-galactosidase. Z- indicates that this gene is non-functional Y+: Y refers to the LacY gene which produces the permease protein. Y+ indicates that this gene is functionalSo based on the breakdown above:
A is true because P+.B is true because I+.C is not true because the lac operon is an inducible system. The operator needs to be able to be repressed. In this case the operator is constitutive (always on) which is not the correct form.D is not true because Z-, no β-galactosidase is produced.E is true because Y+.Only A, B and E apply.
Which motion does the tensor fascia latea perform?
A.
Adduction of the thigh
B.
Extension of the thigh
C.
Abduction of the thigh
D.
Flexion of the thigh
Answer:
C. Abduction of the thigh
Explanation:
The tensor fascia latea performs a motion of an abduction of the thigh.
Horizontal gene transfer can occur through several mechanisms. Why is this relevant to humans?
A. Bacteria are never beneficial to humans.
B. Bacteria can exchange genes for resistance to antibiotics in this way.
C. Bacteria can divide quickly using binary fission.
D. Viruses can infect bacteria, inserting their genetic material into the bacterial DNA.
Answer:
B
Explanation:
Horizontal gene transfer is the transfer of genes across a generation as opposed to down generations in vertical gene transfer. Bacteria can transfer gene horizontally through mechanisms such as transformation and transduction. The ‘male’ bacteria develops pili that it inserts into the ‘female’ bacteria and transfers some genes. This result in recombinant DNA that confers some of the beneficial characteristics to the ‘female’ bacteria that were there in the ‘male’ bacteria. This is how a population of bacteria can develop resistance to an antibiotic really fast.
Final answer:
Horizontal gene transfer is a vital concept in understanding antibiotic resistance among bacteria, as it allows bacteria to exchange resistance genes quickly.
Explanation:
Horizontal gene transfer is relevant to humans primarily because of its role in the spread of antibiotic resistance among bacteria, as captured in option B: Bacteria can exchange genes for resistance to antibiotics in this way. Through mechanisms such as transformation, transduction, and conjugation, bacteria can swiftly adapt to environmental pressures, including the presence of antibiotics. As a result, horizontal gene transfer serves as a significant evolutionary pathway, allowing bacteria to acquire and disperse resistance genes, making infections harder to treat with standard antibiotics.
Native american religions were closely linked to
Native American religions were closely interconnected with the natural world. Their religious rituals, ceremonies, and daily activities were influenced by nature cycle and they held sacred various elements of nature, reflecting their deep respect for their environment.
Explanation:Native American religions were indeed deeply interconnected with the natural world. Native Americans saw a direct bond between themselves and the environment surrounding them, and this played a significant role in their religious beliefs. Various elements of nature like animals, plants, and geographical features were often held sacred and seen as part of the spiritual realm. This connection goes beyond just respect for nature; their religious rituals, ceremonies, and daily lives were intrinsically linked to the cycles of seasons, wildlife behaviors, and agricultural routines. This deep connection to the natural world was reflected in their respect for the land, animals, and resources, leading them to live harmoniously within their environment.
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Identify the word in italics.
Many students do not take advantage of the opportunities that are offered them.
demonstrative pronoun
indefinite pronoun
interrogative pronoun
relative pronoun
not a pronoun
Answer:
it's a demonstrative pronoun
Plants exchange gas with the atmosphere. Which statement accurately describes this process?
A. Plants release carbon dioxide and take in oxygen through the stomata in leaves.
B. Plants release oxygen and take in carbon dioxide through the xylem in leaves.
C. Plants release carbon dioxide and take in oxygen through the xylem in leaves.
D. Plants release oxygen and take in carbon dioxide through the stomata in leaves
Statement A accurately describes respiration in plants.
Explanation:In plant, gaseous exchange occurs with atmosphere during two process namely respiration and photosynthesis. The organ of respiration in plant is called as stomata. They are minor pore like structure located on the surface of the leaves.
The oxygen which is present in the atmosphere enters the plant through the leaves and it is sent to other parts of the plant through diffusion mechanism. As the respiration process is completed, the carbon dioxide which is formed as the end product of the process, is exhaled out of the plant through the stomata.
What are autosomes and how many do humans have?
In bacterial DNA replication of the lagging strand, __________ is required for the synthesis of a new DNA strand whereas __________ is required for removing the RNA primer and replacing it with DNA nucleotides.
Answer:
In bacterial DNA replication of the lagging strand,DNA polymerase III is required for the synthesis of a new DNA strand.
whereas DNA polymerase I is required for removing the RNA primer and replacing it with DNA nucleotides.
Explanation:
Replication: is a process by which two identical copies of DNA are produced from the original DNA molecule.
Bacterial DNA replication take place in three steps
Initiation elongation termination.DNA polymerase III is an enzyme that is responsible for DNA synthesis in bacteria and to carry out the '5-3' polymerase function.
DNA polymerase consists of
pol III core: carry the polymerase activity and proofreading activity of the nucleotides which are mispaired.beta sliding clamp: increase the DNA synthesis rate. clamp loading complex. promote DNA replication.DNA polymerase I: function is to join the Okazaki fragments by removing the RNA primer and replacing it with nucleotides and to repair the damage the DNA.
In bacterial DNA replication of the lagging strand, a primer is required for synthesis of a new DNA strand, whereas DNA polymerase I is required for removing the RNA primer and replacing it with DNA nucleotides.
Explanation:In bacterial DNA replication of the lagging strand, a primer is required for the synthesis of a new DNA strand, whereas DNA polymerase I is required for removing the RNA primer and replacing it with DNA nucleotides.
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How do adult stem cells differ from embryonic stem cells?
A. Adult stem cells have unipotency, and embryonic stem cells have pluripotency.
B. Adult stem cells have totipotency, and embryonic stem cells have multipotency.
C. Adult stem cells have high healing potential, and embryonic stem cells have low healing potential.
D. Adult stem cells can only be used by adults, and embryonic stem cells can only be used by babies.
Answer:
Adult stem cells have unipotency, and embryonic stem cells have pluripotency.
A.
Answer:
A. Adult stem cells have unipotency, and embryonic stem cells have pluripotency.
Explanation:
The basic difference between a stem cell and a totipotent cell is that a stem cell has the potential to regenerate itself apart from producing other cells which are alike, for example hematopoietic stem cell. In contrast to this, a totipotent cell has the potential to develop into an entire organism but it cannot regenerate itself, for example zygote. Zygote can produce the entire organism but once zygote divides to form an embryo it can never become a zygote again.
In the early embryonic stages in mammals when the zygote divides to form 8 celled morula, each of the cell of morula retain its power of regeneration of an entire individual if allowed to develop separately but with advancement in development, the stem cells start to loose their potential to develop into the entire individual and they are confined to only pluripotency which means that they can only form an embryo and some parts of extra embryonic membranes not all of them.
Further when gastrula stage arrives, the power of cells to regenerate reduces even more and become restricted to only multipotency.
In the end, when the entire individual is developed the adult stem cells remain the only cells which have power of regeneration and they have unipotency which means that they can regenerate only one type of tissue. For example, skin cells are unipotent cells which can only regenerate skin.