Answer: True.
Spleen framework is created by reticular fibres from reticular cells.
Explanation:
Spleen is an organ found mostly in vertebrates. It develop from mesenchymal cells within the dorsal of mesogastrium near the greater curvature stomach. The mesencymal cells then divide and differentied to form framework of connective tissues of spleen. The framework of spleen is created by reticular fibres of the reticular cells. Reticular fibres are fibres in the connective tissue that is composed of type iii collagen secreted by reticular cells. Spleen function in filtering of blood. It plays a major role in red blood cells and immune system.
Answer:
True.
Explanation:
The spleen is a lymphoid organ with several hematological and immunological functions. It is located in the upper left quadrant of the abdominal cavity. Externally, the spleen is surrounded by a layer of tissue called a capsule, formed by dense fibrous connective tissue, which emits trabeculae inwards. The framework of the connective tissue located between the trabeculae is formed by a network of reticular fibers (which normally gives support) and it’s made by reticular cells (which are found in the tissue and lymphoid organs), being lymphocytes (cells smallest free connective tissue) one of the most predominant elements.
Feather color in budgies is determined by two different genes, Y and B, one for pigment on the outside and one for the inside of the feather. YYBB, YyBB, YYBb or YyBb is green; yyBB or yyBb is blue; YYbb or Yybb is yellow; and yybb is white.
A blue budgie is crossed with a white budgie. Which of the following results is possible?
A) Green offspring only
B) Yellow offspring only
C) Blue offspring only
D) Green and yellow offspring
E) a 9:3:3:1 ratio
Answer:
Blue offspring only
Explanation:
If A blue budgie is crossed with a white budgie.
i.e yyBB or yyBb × yybb
let use yyBb for blue budgie,so we have; yB, yb, yB, yb representing the columns on the horizontal rows of the punnet square.
on the other hand, in white budgie yybb, we will have yb, yb, yb, yb representing the rows on the vertical column of the punnet square.
if a dihybrid cross occurs among these representative, all progeny in the punnet square will be yyBb, showing that they are all Blue offspring only.
Option D) Green and yellow offspring
The possible outcome of crossing a blue budgie (genotype yybb) with a white budgie (genotype yybb) is green and yellow offspring.
When a blue budgie (yybb) is crossed with a white budgie (yybb), all the offspring will have the genotype Yybb, resulting in a green feather color.
However, when a blue budgie (yybb) is crossed with a white budgie (yybb), there is a possibility of producing offspring with the genotype YYbb or Yybb, resulting in a yellow feather color.
Therefore, the possible outcomes are green and yellow offspring, represented by option D.
Ecologic studies_________________.
a. are expensive and require a great deal of time to conductb. are a good approach for generating hypotheses
c. provide accurate measurements of exposure
d. yield results that can be applied directly to individuals
Answer:
b. are a good approach for generating hypothesesb. are a good approach for generating hypotheses
Why does pulse (and breathing rate) increase during exercise? (relate to cellular respiration)
Answer:
Explanation:
During exercise, the rate of breathing increases in order to fulfill the needs of oxygen required by the body for the release pf energy required. The body activity and muscles are in movement and required more energy than at rest. The absorbance of oxygen in to the blood increases which will increase the heart beat and also carbon dioxide starts removing from the blood. the lungs must provide more oxygen to the blood during the exercise.
so as the activity level increases, the demand for oxygen increase which will increase the breathing to take in more oxygen from outside in to lungs so that the lungs pump more oxygen to the hearth which will deliver to the muscles for activity.
Pulse and breathing rates increase during exercise to meet the higher oxygen demands of the muscles and repay the oxygen debt incurred. This heightened respiratory activity is due to several neural and chemical factors, including the immediate neural response to exercise and the need to restore cellular ATP. Breathing remains elevated post-exercise until the body's oxygen levels are normalized.
Explanation:During exercise, the body's demand for oxygen increases to support the intensified activity of the muscles. This increased demand leads to an oxygen debt, a condition where the body needs more oxygen than what has been supplied during the exercise. To meet this demand and repay the oxygen debt, there is a rise in pulse and breathing rate.
The increased breathing rate or hyperpnea, which includes both an increased rate and depth of breathing, ensures that more oxygen is taken into the lungs and transported to the muscles, while more carbon dioxide is expelled. This response is driven by several factors, including the body's immediate neural responses to exercise involving psychological stimuli, activation of motor neurons, and stimulation of proprioceptors, as well as the need to restore ATP and creatine phosphate levels, convert lactic acid to pyruvic acid, and maintain appropriate blood pH levels.
You get the results of Mrs. M’s blood tests and see that the osmolarity of her blood is higher than normal. What is the most likely explanation for the increased concentration of Mrs. M's blood?
Answer:
The correct explanation for high osmolatrity in Mrs M's blood is high percentage of particle than dilution. This mean blood and urine is more concentrated which result in more production of ADH (anti diuretic hormone)
Explanation:
Osmolarity is a test which determined the concentration level of particle and dehydration level in one body. Higher the percentage of dilution of blood more easy is the chance to move nutrient into the blood. High concentration of blood make easy to throw out waste product move out of the body.
The correct explanation for high osmolatrity in Mrs M's blood is high percentage of particle than dilution. This mean blood and urine is more concentrated which result in more production of ADH (anti diuretic hormone)
Linda is conducting a research study on osteoporosis, and she wants her study to create awareness among those most affected by the disease. In this scenario, her target group would most likely be:
Answer: Case control analysis
Explanation:
There should be 3 target groups, 1 of them is optional.
1) Patients of osteoporosis undergoing medical and physical therapy
2) Patients of osteoporosis not undergoing medical and physical therapy
3) Control group
A news article discussing the evolution of domestic dogs from wolves included this statement: "On its way from pack-hunting carnivore to fireside companion, dogs learned to love or at least live on wheat, rice, barley, corn, and potatoes." What is a more scientifically accurate way to state what happened with dogs?
Answer:
The answer is evolutionary purpose.
Explanation:
Some wolves may have had variants in their digestion that allowed them to eat wheat, rice, barley, corn, and potatoes, and so they were able to survive with humans.
A researcher is comparing the species diversity of two islands. Both islands are roughly equal in size. However, one island is much closer to the mainland. She determines that the S value for the island closer to the mainland is _____ the S value for the island located farther from the mainland. In addition, she finds that the closer island's extinction rate is _____ the extinction rate on the farther island.
Answer:
The S value for the island closer to the mainland is higher/bigger than the S value for the island located farther from the mainland.The closer island's extinction rate is equal to the extinction rate on the farther island.Explanation:
Island biogeography theory establishes that the two factors that affect species richness in natural communities on an island are the distance from the mainland and the size of the island.
At the same time, these factors affect inmigration and extinction rates.
According to the theory, islands that are closer to the continent have higher possibilities of receiving immigrants than those islands that are located farther from the mainland. This is the effect of distance.
The effect of size is reflected in the relation between island size and species diversity. In smaller islands, the probability of extinction is higher than in bigger islands. Bigger islands can have more species than smaller ones.
In the case of two islands of the same size and different distance to the mainland, both of them will have the same extinction rate, but the one closer to the continent will have a higher immigration rate, and so, a higher amount of species. The S value will be higher on the island closer to the continent.
An advantage of gas exchange in fresh water, compared with gas exchange in air, is that _____.
a. water usually contains a higher concentration of oxygen than air
b. ventilation requires less energy in water
c. the respiratory surface does not have to be as extensive in water
d. water is easier to move over the respiratory surface
e. water loss through evaporation across the respiratory surface can be minimized
Final answer:
Water loss through evaporation is minimized during gas exchange in fresh water, which is advantageous for aquatic organisms. They use gills to facilitate the diffusion of oxygen from water to their bloodstream or coelomic fluid, ensuring efficient gas exchange even though oxygen's concentration is lower in water than in air.
Explanation:
An advantage of gas exchange in fresh water, compared with gas exchange in air, is that water loss through evaporation across the respiratory surface can be minimized. This is significant because, unlike the air environment, organisms living in water do not face the challenge of keeping their respiratory surfaces moist to facilitate diffusion. In aquatic environments, oxygen dissolves in water but at a lower concentration than in the air. Freshwater organisms like fish utilize gills, which are thin, highly branched, and folded tissue filaments that provide a large surface area for the diffusion of oxygen into the bloodstream or coelomic fluid, depending on the organism.
Gas exchange in water involves the movement of oxygen from areas of higher concentration in the water to areas of lower concentration in the blood or coelomic fluid. The water passing over the gills allows aquatic organisms to take up the dissolved oxygen needed for survival, and the gills ensure this process is efficient despite the comparatively lower concentration of oxygen in water.
Desmosomes connects keratinocytes to each other. Why is this important?
Answer:
Desmosomes as structured are two adjacent attached cells formed in the cell membranes from protein plaques while connected by filaments. The function of separating an organism from its environment is performed by epithelial keratinocytes.
To protect the organism, the keratinocytes are connected by the desmosome filaments through adherence. The adhered keratinocyte / desmosome connection produces prekeratin, a fibrous protein that adds to the epidermis a soluble structure
What are population dynamics?
a) Number of individuals born each year in a population.
b) Changes in populations through time.
c) Proportion of individuals at each possible age.
d) Regular fluctuations in the population size of some animals.
Answer: Changes in populations through time.
Explanation: Population dynamics is defined as the study of certain population as regards it's age composition and size and factors that influence the population such as the death and birth rate of the population.
How did the lab activities help you answer the lesson question: How does human activity affect Earth’s freshwater resources? What did you learn from conducting this lab?
Answer:
Explanation:
In the lab, I observed how pollutants affect the pH of lakes and groundwater. Pollutants that result from human activity such as using soap and citric acid can change the pH of water. If the pH of the water changes, it might not be safe for people to drink that water or for organisms to live in it. I also learned that the pollution in a lake can end up in groundwater. Even though the soil can filter some pollutants and the water may look clean, its quality may not be good.
Answer:
In the l learned three main three main things that influence the freshwater available on earth: PH, pollutants and factory usage.
Explanation:
The first thing, PH, is really influenced by the way the pollutants are discarded, for example, if a factory decides to throw their pollutants inside a very good and not polluted river, this river will change how it chemically works, and through that, the PH will change, it can turn into a more acid or basic river, depending on the components that were thrown there.
I learned from conducting this lab that every act of the human race affects the environment as a whole, and the main thing to pay attention to in this experiment is that, everything is linked to one another in some way.
1. A _____ is placed at the beginning of the word (applies always).2. A _____ is placed at the end of the word (applies always).3. The _____ plane divides the body into front and back portions.4. Adip/o means _____ .5. The main shaft-like portion of a long bone is known as the _____ .6. The prefix ecto- means _____ .7. A medical scientist who specializes in the study of tissues is a _____ .8. The prefix hydro- means _____ .9. The outer layer of the skin that contains no blood or nerve supply is the _____ .10. The suffix that means blood condition is _____ .11. The suffix that means pregnancy is _____ .12. The three layers of protective membranes that surround the brain and spinal cord are known as the _____ .13. The middle, muscular layer of the heart is the _____ .14. The _____ is a pear-shaped, hollow, muscular organ that houses the fertilized implanted ovum as it develops throughout pregnancy.15. Another name for fever is _____ .
Answer:Answer:
1.prefix
2. Suffix.
3. The coronal plane.
4. Adipo means fatty tissues.
5. Diaphysis.
6. Ecto means external.
7. Pathologist.
8. Prefix hydro means water.
9. The dermis.
10. emia.
11. Cyesis.
12. The dura mater, arachnoid mater and the pia mater.
13. The myocardium.
14. Uterus or womb.
15. Pyrexia
Explanation:
1. Prefix is added at the beginning of the word.
2. Suffix is placed at the end of the word.
2. Coronal plane is the plane that divides the body into dorsal and ventral portion(front and back).
4. Adipo means fat or fatty tissues.
5. Diaphysis is the shaft of long bone. It is made of cortical tissues and contains bone marrow and adipose tissues.
6. Ecto means external or outside.
7. Pathologist is a scientist that specialized in the study of body tissues. Histopathology is the study of diseased tissues.
8. Hydro means water.
9. The dermis is the outer layer of the skin that contains blood and nerve supply. It is water proof and is a defence against infection.
10. Emia is a suffix that means blood condition. Anaemia means absence of blood and hypervolemia means too much of blood.
11. Cyesis means pregnancy and its a stage between fertilization and birth.
12. The meninges is the layer that surrounds the brain and the spinal cord. It consist of three layers which are dura mater, arachnoid mater and pia mater.
13. The myocardium is the external muscular layer of the heart that contains the cardiac muscle tissues. It also take part in pumping of blood.
14. The uterus or womb is a peer shaped muscular organ of female reproductive system that house the implant ovum as its develop through out the pregnancy period.
15. Pyrexia or febile response is when the temperature of the body is higher than the normal body temperature due to increased body temperature.
A patient who was on chemotherapy is taking a new medication, which is available in a pre-filled syringe and is given subcutaneously.
Which statement by the patient during an assessment helps the nurse individualize the teaching plan?
"I used to administer subcutaneous injection to my father."
"I was instructed to take this medication the very next day after chemotherapy."
"I learned that this medication helps me reduce the risk of decreased immunity."
"A friend of mine who is undergoing chemotherapy was also prescribed this.
Answer:
"A friend of mine who is undergoing chemotherapy was also prescribed this.
Explanation:
it is a supporting statement
In prokaryotes, there are no membrane-bound organelles and no nuclear membranes. In addition, there are no mitochondria. Where are the electron transport chain and the ATP synthase working? What physical place are they in a prokaryotic cells?
Answer:
Prokaryotes lack membrane-bound organelle like mitochondria and chloroplast which is used by eukaryotes to synthesize ATP but ATP synthesis also takes place in prokaryotes. The electron transport chain and ATP synthetase of prokaryotic cells are embedded in the cell's plasma membrane of the prokaryotes.
The ATP synthesis in prokaryotes is similar to eukaryotes. NADH releases electrons to the electron carriers that are embedded in the plasma membrane which causes the translocation of H+ ions to the cell membrane outer face against the concentration gradient.
Then these electrons pass through the ATP synthetase which generates ATP for prokaryotic cell. So cell membrane is the physical place where ETC and ATP synthetase are present.
What mechanisms help infants survive before they have an opportunity to learn adaptive behavior?
Answer:
Reflexes
Explanation:
The complete question is :
What mechanisms help infants survive before they have an opportunity to learn adaptive behavior?
a. Dynamic systems
b. Motor skills
c. Reflexes
d. Vision and hearing
A muscle reaction that takes place automatically in response to stimulation is termed as a reflex action. The reflexes that are present in infants which helps them to survive before they display adaptive behavior are termed as infant reflexes.There are several reflexes that are displayed by the infants such as :Sucking reflex - the infant sucks when an area around the mouth is touchedStartle reflex - the infant pulls his arms and legs in after hearing a loud noiseStep reflex - the infant performs stepping motions when the sole of the foot touches a hard surfaceThere are many more such reflexes present in the infants that are absent in the adults.
Mucosae of a healthy intestinal tract _____. (Select all that apply.)
A. have a large number of activated T and B cells
B. harbor T cells bearing a very wide diversity of antigen specificities
C. contain intraepithelial lymphocytes
D. have large numbers of resident neutrophils
E. are populated with both α:β and γ:δ effector T cells.
Answer:
Option (A), (C) and (D).
Explanation:
A mucosa is the membrane that mainly lines the body cavities and covers the internal surface organ of the body. The mucosa is present in the whole intestinal tract.
This mucosa plays an important role in the immunity of the organisms. The mucosa contains both the B cells and T cells that plays an important role in humoral immunity and cell mediated immunity. The neutrophils plays an important role in the inflammation and also phagocytose the cell.
Thus, the correct answer is option (A), (C) and (D).
You have learned that the fusion of egg and sperm produces a zygote. But how does the sperm reach the egg, and how does the zygote develop into a seed, which eventually germinates and grows into a mature sporophyte? In this activity, you will demonstrate your understanding of double fertilization and seed development in angiosperms.
Drag the statements to their appropriate locations on the flowchart of pollination, fertilization, and seed development.
a. pollen tube grows down the style
b. generative, cell divides, forming 2 sperm
c. 2 sperm are discharged into the female gametophyte
d. sperm fuse with the egg & 2 polar nuclei
e. zygote forms & divides into a terminal cell & a basal cell
f. cells of the embryo differentiate into three tissue types
Answer:
Pollination: a. pollen tubes grow down the style.
Fertilization: c. 2 sperm are discharged into the female gametophyte.
d. sperm fuse with the egg & 2 polar nuclei
Seed development: b. generative, cell divides, forming 2 sperm.
e. zygote forms & divides into a terminal cell & a basal cell
f. cells of the embryo differentiate into three tissue types
Explanation:
Fertilization is the fusion of one or more sperm with an egg or the female gametophyte in the case of vegetables as option C and D describes.
Pollination is the process that flower plants use to reproduce with the help of insects that transport pollen from one flower to other depositing it in the pollen tubes that grow down the style in order to connect with the ovary of the flower as option A describes.
As regards seed development once that the fertilization is finished the seed starts to grow as option E and F describes. Option B describes the development of sperms, this process occurs before fertilization and through mitosis and meiosis.
After mixing A heat-killed, phosphorescent (light-emitting) strain of bacteria is mixed with a living, non-phosphorescent strain. Further observations of the mixture show that some of the living cells are now phosphorescent. Which of the following observations would provide the best evidence that the ability to phosphoresce is a heritable trait?
Answer:
Phosphorescence in descendants of the living cells.
Explanation:
The DNA acts as the heritable molecule that pass down from the parents to their offsprings and move from one generation to the next generation. Different experiments had been done to identify the heritable molecules.
In an experiment, non fluorescent become fluorescent when mixed with the dead fluorescet cells. This means the material has been transformed to the non fluorescent cells. The phosphorescent acts as the descendants in the living cells and may be inherited to the future generations as well.
Match the following. 1. the condition of having gametes similar in shape, but different in size gymnosperm 2. the condition of having anisogametes gonad 3. the part of the stamen of a flower that bears the pollen antheridium 4. an organ in simpler plants that produces sperm cells isogamete 5. an organ in lower vascular plants, gymnosperms, mosses, and liverworts which produces an egg cell motile 6. a reproductive organ of gymnosperms having a central axis with radiate scales and bracts; can either produce pollen or ovules anisogamy 7. an act of fertilization involving the transfer of cell contents to another cell; usually occurs in simpler organisms flagellum 8. a large gamete with stored food anther 9. a long, whip-like structure extending from a cell used for locomotion cone 10. an organ of lower plants, some protists and some fungi that produces gametes gametangium 11. gamete producing organs in animals anisogamete 12. cone-bearing plant; often called evergreen conjugation 13. incapable of independent movement immotile 14. gametes that are the same in size and shape aronium 15. capable of independent movement
Answer:
The correct match is given below:
Explanation:
The condition of having gametes similar in shape, but different in size – anisogametes.The condition of having anisogametes - anisogamyThe part of the stamen of a flower that bears the pollen – antherAn organ in simpler plants that produces sperm cells – antheridium An organ in lower vascular plants, gymnosperms, mosses, and liverworts which produces an egg cell - archegonium A reproductive organ of gymnosperms having a central axis with radiate scales and bracts; can either produce pollen or ovules – cone An act of fertilization involving the transfer of cell contents to another cell; usually occurs in simpler organisms – conjugation A large gamete with stored food - Egg A long, whip-like structure extending from a cell used for locomotion- Flagellum An organ of lower plants, some protists and some fungi that produces gametes - gametangium Gamete producing organs in animals – gonads Cone-bearing plant; often called evergreen – GymnospersIncapable of independent movement - immotile Gametes that are the same in size and shape - isogametes Capable of independent movement- motileFinal answer:
In biology, isogamy involves identical gametes, whereas anisogamy features distinct male and female gametes, typically larger eggs and smaller sperm. A gametophyte is a life stage that produces gametes, and a sporophyte produces spores leading to gametophyte development in plants.
Explanation:
The terms provided are fundamental to understanding plant reproduction and life cycles in biology. Isogamy refers to the production of gametes that are equal in size and shape, while anisogamy, also known as oogamy, involves gametes of different sizes and shapes, typically a larger non-motile egg and smaller motile sperm. The gametophyte is the plant or phase in the plant's life cycle that produces gametes.
Gametangium is the structure within which gametes are produced, commonly found in multicellular protists, algae, fungi, and the gametophytes of plants. The sporophyte is the diploid phase that bears a sporangium, which produces spores that will develop into gametophytes, leading to sexual reproduction through the production of male and female gametes.
In the lizard species L. vivipara, most females from the colder, mountainous part of the range live much longer than do individuals from warmer, lowland regions. Compared to the lowlands, what life-history trait is expected in lizards living in the mountains?
A. Equivalent fecundity
B. Increased fecundity
C. Decreased fecundity
Answer:
C Decreased fecundity
Explanation:
Decreased fecundity.
Fecundity is nothing but the ability to reproduce.
Lizards living in colder climates cannot reach the body size required for reproduction. As a result, they invest available energy to increase the body size as a result of which, they enter reproduction later.
Motor neurons release the neurotransmitter acetylcholine (ACh) and acetylcholinesterase degrades ACh in the synapse. If a neurophysiologist applies onchidal (a naturally occurring acetylcholinesterase inhibitor produced by the mollusk Onchidella binneyi) to a synapse, what would you expect to happen?
The question is incomplete. The complete question is:
Motor neurons release the neurotransmitter acetylcholine (ACh) and acetylcholinesterase degrades ACh in the synapse. If a neurophysiologist applies onchidal (a naturally occurring acetylcholinesterase inhibitor produced by the mollusk Onchidella binneyi) to a synapse, what would you expect to happen?
A) paralysis of muscle tissue
B) convulsions due to constant muscle stimulation
C) decrease in the frequency of action potentials
D) no effect
Answer:
B. convulsions due to constant muscle stimulation
Explanation:
In response to an action potential, acetylcholine released at the neuromuscular junction or synapse. The release of acetylcholine is followed by its binding to the receptors in the motor endplate and finally triggering a muscle action potential which in turn leads to muscle contraction. Termination of activity of acetylcholine (Ach) is mediated by acetylcholinesterase which destroys ACh and thereby prevents firing of another muscle action potential.
If acetylcholinesterase inhibitor is administered to a synapse, acetylcholine will keep on triggering the muscle action potential causing continuous muscle contraction and irregular body movements (convulsions).
New biosensors, applied like a temporary tattoo to the skin, can alert serious athletes that they are about to "hit the wall" and find it difficult to continue exercising. These biosensors monitor lactate, a form of lactic acid, released in sweat during strenuous exercise.
Which of the statements below is the best explanation of why athletes would need to monitor lactate levels?
A. During anaerobic respiration, lactate levels increase when muscles cells need more energy, however muscles cells eventually fatigue, thus athletes should modify their activities to increase aerobic respiration.
B. During aerobic respiration, muscles cells produce too much lactate which causes a rise in the pH of the muscle cells, thus athletes must consume increased amounts of sports drinks, high in electrolytes, to buffer the pH.
C. During anaerobic respiration, muscle cells receive too little oxygen and begin to convert lactate to pyruvate (pyruvic acid), thus athletes experience cramping and fatigue
D. During aerobic respiration, muscle cells cannot produce enough lactate to fuel muscle cell contractions and muscles begin to cramp, thus athletic performance suffers.
Answer:
The answer is letter A.
Explanation:
During anaerobic respiration, lactate levels increase when muscles cells need more energy, however muscles cells eventually fatigue, thus athletes should modify their activities to increase aerobic respiration.
Displacement of brain tissue under the falx cerebri or through the tentorial notch of the tentorium cerebelli is termed ____, and occurs with elevated ICP in one brain compartment with displacement of cerebral tissue toward an area of ___ pressure.
Brain herniation is displacement of brain tissue under the falx cerebri under the area of less pressure.
Brain herniation
Less
Explanation:
Brain herniation is disorder it occur due to the displacement of the cerebra in the brain. It is potentially deathly disorder when brain affected by high temperature or squeezing of the brain across the structure.
The tentorium is the dual fold in the brain, then it is an extension of the dura matter that separates cerebellum from cerebrum. There are two major types of herniation in the brain; that is supratentorial and infratentorial. The supretentorial is seen above the Tentorial notch.
A scientist is using a computer model to predict changes to a population of rabbits in a meadow. Identify the information about the rabbit population that should be included in the computer model.
Answer:
In the mentioned case, the intrinsic and environmental factors influencing the size of the population should also be included in the computer model. The population size is primarily predicted by environmental and intrinsic factors.
The size of the population of any species is monitored by the factors like birth rate, death rate, limiting factors, and their accessibility, carrying capacity of the system, rate of migration, and others. All these elements should be taken into consideration in order to determine the changes observed in the population of rabbits in a meadow.
What accounts for the uniform diameter of the DNA molecule? A.The two sides of the DNA molecule are held together by hydrogen bonds.
B.A purine always bonds with a pyrimidine.
C. One side of the DNA molecule has an unconnected 5' phosphate group and the opposite end has an unconnected 3' hydroxyl group.
D. The 3' carbon of one deoxyribose and the 5' carbon of another deoxyribose bond together.
E.The alternating sugar and phosphate backbone coils around the outside of the helix.
Answer:
B. A purine always bonds with a pyrimidine.
Explanation:
DNA is a polymer of deoxyribonucleotides each of which has a nitrogenous base, a pentose sugar and phosphate group. There are two types of nitrogenous bases present in DNA. Adenine and guanine are the purine bases and have two rings in their structure while the cytosine and thymine are the pyrimidine bases with a single ring structure.
A purine base of one DNA strand always pairs with the pyrimidine base of another DNA strand. Adenine (purine) makes two hydrogen bonds with thymine (pyrimidine) while guanine (purine) makes three hydrogen bonds with cytosine (pyrimidine). The pairing of a purine with a pyrimidine base keeps the diameter of a DNA double helix uniform throughout the length. For instance, the diameter of B-DNA is around 20 angstrom.
The hallmark manifestations of Cushing syndrome are a moon face, a "buffalo hump" between the shoulder blades, and a protruding abdomen. What other manifestations of Cushing syndrome occur?
Answer:
Other manifestations of Cushing syndrome are weight gain, purple stretch marks on the arms, thigh, breasts and abdomen.
Thinning skin, Acne, Muscle weakness, Fatigue and Skin injuries that are slow in healing.
Explanation:
Cushing syndrome is also known as hypercortisolism, and it occurs because of abnormal high levels of the hormone cortisol.
This hormone may be produced in the body due to malnutrition, alcoholism, depression and use of medication, Corticosteroids.
Which statement is true about evolutionary success? a) A successful organism can find food, escape predators, and reproduce. b) Vertebrates are the most evolutionarily successful. c) Any species that arises on earth is evolutionarily successful. d) Humans are the crowning achievement of evolution. e) Darwin said that some species are better than others.
Final answer:
A successful organism's ability to find food, escape predators, and reproduce encapsulates true evolutionary success, emphasizing survival and reproductive capabilities over any species-ranking metrics.
Explanation:
The true statement about evolutionary success is a) A successful organism can find food, escape predators, and reproduce. Evolutionary success is assessed by an organism's ability to survive and continue its lineage through reproduction.
The success of an organism is not influenced by an inherent ranking of species or the belief that humans are the peak of evolution; rather, it depends on adaptability and the ability to thrive within specific environmental conditions. Concepts such as evolvability, the struggle for existence, and inherited variations reinforce the understanding that an organism's reproductive success is the true measure of its evolutionary fitness.
Phytoplankton use sunlight to gain energy through photosynthesis. As a result of the Law of Conservation of Energy, phytoplankton cannot gain more energy than it consumes. A closed system consisting of an aquarium, phytoplankton, and sunlight is set up. Which of the following methods would best demonstrate the Law of Conservation of Energy? (3 points)
A) Measure the mass and temperature of the water. Then cover the aquarium to block the sunlight and measure the mass of the phytoplankton.
B) Change the closed system to isolated, so that energy can move out of it. Then measure the amount of energy that leaves.
C) Measure the mass of the phytoplankton before and after photosynthesis. Add the mass of the water.
D) Measure the amount of energy in the phytoplankton and the amount of light entering the aquarium. Then measure the amount of energy in the phytoplankton after exposure to the light and determine the difference.
E) Measure the amount of energy in the phytoplankton and the amount of light entering the aquarium. Then measure the amount of energy in the phytoplankton after exposure to the light and determine the difference.
Measure the amount of energy in the phytoplankton and the amount of light entering the aquarium. Then measure the amount of energy in the phytoplankton after exposure to the light and determine the difference.
Explanation:
Phytoplanktons like most of the plants use chlorophyll, sunlight and carbon di-oxide for photosynthesis but it depends on other organisms to consume extra energy as they are unable to gain enough energy from their consumption of light. This differs among the different species of planktons.
It can be observed in an aquarium that a phytoplankton is gaining less energy than the energy they have absorbed by the light and this can be done by measuring the energy before and after the photosynthesis.
Brian often interrupts his teacher while she is speaking and frequently forgets to complete his homework assignments. He also has difficulty taking turns in playground games with classmates. Brian most clearly exhibits symptoms of
Answer:
ADHD (attention deficit hyperactivity disorder)
Explanation:
ADHD is a neurodevelopmental disorder in which a person often acts inappropriately with regards to his age, has difficulty paying attention to things and often acts without taking into consideration the consequences of his/her actions. A person suffering from this syndrome exhibits symptoms that are often noticed in the school, home or during recreational activities such as playground games and mostly before 12 years of age. The child also shows restlessnesss and hyperactive behavior. Since Brain exhibits all these symptoms - hyperactivity (interrupts the teacher), forgets homework (lack of attention) and difficulty taking turns in playground games, he is most probably suffering from ADHD.What abiotic factors determine the type of terrestrial biome? Why is the tropical rainforest the most diverse terrestrial biome? Put the zones of freshwater lakes and ponds in order of most sunlight to least sunlight: profundal, littoral, limnetic. Why do different biomes have different plant and animal species?
The abiotic factors that determine the type of terrestrial biome are sunlight, wind, rainfall, humidity, level of pollution etc.
Tropical rainforest is the most diverse terrestrial biome because of the availability of enough rainfall and sunlight.
Littoral, limnetic, profundal.
Different biomes have different plant and animal species because they have different abiotic factors.
Explanation:
Abiotic factors like temperature, amount of sunlight, rainfall, humidity , level of pollution etc can determine the type of biome. Tropical rainforests are located at the tropical regions which receive greater amount of sunlight and rainfall. Availability of sunlight and rainfall in plenty supports diverse life forms making the tropical rainforests the most diverse terrestrial biome.
The zones of freshwater lakes and ponds arranged in terms of maximum sunlight availability to minimum sunlight availability is littoral, limnetic, profundal. Littoral zone is the region nearest to the shore and receives maximum amount of sunlight. Limnetic zone doesn’t receive sunlight till the bottom.
Profundal zone is underwater and covered by mud and thus receives minimal amount of sunlight.The species of plants and animals that can be found in a biome depends on the conditions of the biome. Several abiotic factors are crucial in determining the type of a biome.
Thus two different biomes will have different species types as well.
Answer:
The abiotic factors that determine a terrestrial biome are weather, climate, latitude and amount of sunlight an area receives, and nutrients available.
The amount of precipitation and the warm climate in the tropical rainforest support more organisms in that area. There are fewer limiting factors in the tropical rainforest.
The order of most to least sunlight is littoral zone, limnetic zone, and profundal zone.
Biomes are different because of their differing latitude, climate, weather, amount of sunlight, and precipitation. All organisms have a range of tolerance for the temperature, amount of sunlight, and precipitation in which they can survive.
Explanation:
Penn Foster