A single codon corresponds to one specific amino acid, making the statement false. The codons for tyrosine are the same in both plants and humans, which is true. The start codon signifies the beginning of translation and also encodes for the amino acid methionine, which is also true.
The statement that a codon can specify more than one amino acid is false. A codon, which is a group of three nitrogen bases in nucleic acids, corresponds to one specific amino acid in the genetic code. There are some instances, known as the wobble effect, where different codons may code for the same amino acid, but a single codon does not encode for multiple amino acids.
The codons that specify tyrosine are indeed the same in both plants and humans, reflecting the virtually universal nature of the genetic code. This fact emphasizes the similarity in the way that different organisms translate RNA sequences into proteins.
Regarding the start codon, the statement is true. The start codon, typically AUG, not only signals the beginning of the protein-coding region but also codes for the amino acid methionine.
What are autosomes and how many do humans have?
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.
The muscles in the leg are considered long muscles. As the muscles in the leg contract and relax they work to provide movement. What would happen if the upper leg muscles were damaged?
Your femur and hamstrings would not be held in place.
You would be able to move your knee to flex and extend your leg.
You would not be able to extend the leg straight.
Your hipbone will be dislocated causing a deformity in your side.
Answer:
You would not be able to extend the leg straight
The hamstrings start at the pelvis and end in the lower leg so they wouldn't be affected.
If the muscles are damaged movement is not possible.
The Hip bone is more attached to the pelvis and bone rather than upper leg muscles.
If the upper muscles are damages, movement would be extremely painful or impossible if we assume the sliding filament theory is correct making that the correct answer.
(Give me Brainliest)
Answer:
You would not be able to extend the leg straight.
Explanation:
During which phase of mitosis does the nuclear envelope re-form?
Answer:
In which phase of mitosis do chromosomes align at the center and spindle fibers become visible? Explanation: Mitosis involves four distinct stages: prophase, metaphase, anaphase, and telophase. Prophase is the first step of mitosis, during which chromosomes condense and the nuclear envelope dissolves.
The nuclear envelope re-forms during the telophase phase of mitosis. It's in this phase that the chromosomes decondense, mitotic spindles are broken down and the nuclear envelopes form around the chromosomes.
Explanation:The nuclear envelope re-forms during the telophase phase of mitosis. This phase is also referred to as the "distance phase," where the chromosomes reach the opposite poles and begin to decondense or unravel, relaxing into a more stretched-out chromatin configuration. The mitotic spindles are broken down into tubulin monomers that will be used to assemble cytoskeletal components for each daughter cell.
Finally, nuclear envelopes form around the chromosomes and nucleosomes appear within the nuclear area, signaling the end of mitosis, and the beginning of cytokinesis, the process of physical separation of the cytoplasmic components into two daughter cells.
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Loss of lung tissue elasticity is characteristic of
The loss of lung tissue elasticity is a hallmark of emphysema, a respiratory disease. The air sacs' elasticity loss results in difficulty with exhalation and a feeling of breathlessness.
Explanation:The loss of lung tissue elasticity is a primary characteristic of a respiratory disease called emphysema. When we breathe in, our lungs expand due to the elasticity of the lung tissues. But in emphysema, this elasticity is lost which makes exhalation difficult. This happens because the walls of the air sacs (alveoli) are damaged and hence, they lose their elasticity making it harder for the air to get out. Consequently, this leaves a residual volume of air in the lungs and gives a feeling of breathlessness to the patients suffering from this disease. Emphysema is primarily caused by long-term exposure to irritants like smoking and air pollution.
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The loss of lung tissue elasticity is a characteristic symptom of obstructive diseases like emphysema and asthma, as well as restrictive diseases like respiratory distress syndrome and pulmonary fibrosis. This decreased elasticity leads to trapping more air in the lungs after exhalation, and the lung tissues becoming less compliant and more stiff or fibrotic.
Explanation:The loss of lung tissue elasticity is characteristic of obstructions and diseases such as emphysema or asthma. Emphysema results predominantly from smoking tobacco, where the alveoli walls are destroyed, thus decreasing the surface area for gas exchange. This destruction increases lung compliance as the alveolar walls become damaged and lung elastic recoil decreases due to the loss of elastic fibers. As a consequence, more air is trapped in the lungs at the end of exhalation.
In asthma, inflammation hinders the airways, possibly due to edema (fluid accumulation), spasms in the bronchioles' muscle walls, increased mucus secretion, epithelia damage, or a combination of these elements. Those who have obstruction diseases like asthma trap significant volumes of air after exhaling and tend to breathe at a very high lung volume, compensating for lack of airway recruitment.
The loss of lung tissue elasticity, leading to the lungs becoming increasingly stiff and less pliable, is also observed in restrictive diseases such as respiratory distress syndrome and pulmonary fibrosis. Here, airways are less compliant and are recognized as being stiff or fibrotic due to a decrease in compliance as the lung tissue cannot bend and move as required.
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Bilaterally symmetrical animals tend to have all of the following except:Question 4 choicesChoice A., a distinct head and tail end.Choice B., one plane of symmetry running from head to tail.Choice C., sensory organs concentrated in the head.Choice D., poorly developed organ systems.
Answer:
Bilaterally symmetrical animals tend to have all of the following except: poorly developed organ systems.- Choice D.
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
Answer:
C. Plants release carbon dioxide and take in oxygen through the xylem in leaves.
Explanation:
Plants exchange gas with the atmosphere and release carbon dioxide and take in oxygen through the xylem in leaves.
Answer: D. Plants release oxygen and take in carbon dioxide through the stomata in leaves
Explanation:
Plants evolved from freshwater green algae and eventually developed strategies that adapt them well for life on land. The major source of plant nutrition is the fixation of atmospheric CO2 into simple sugar using the energy of the sun. CO2 enters through the stomata. O2 is a product of photosynthesis and atmospheric component that also moves through the stomata. It is used in cellular respiration to release energy from the chemical bonds in the sugar to support growth and maintenance in the plant. Water and gas diffusion into and out of a plant occurs through tiny mouth-shaped openings called stomata (singular, stoma).
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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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.
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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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 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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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.
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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Which of the following describes the ability of a single gene to have multiple phenotypic effects?
A) pleiotropy
B) incomplete dominance
C) epistasis
D) multiple alleles
E) none of the abov
Answer:
A, pleiotropy.
Explanation:
Pleiotropy - genes that have multiple phenotypic effects. Remember that phenotype means a physical characteristic caused by a gene, such as eye color or fur patterns.
Incomplete dominance - when neither allele is dominant and they mix together in the phenotype. A popular example is a red flower crossing with a white flower and resulting in a pink flower.
Epistasis - when two genes contribute to the phenotype, but one gene completely masks another gene. An example would be labrador fur colors.
Multiple alleles - 3 or more alternative forms of a gene, but only 2 alleles can occupy an organism. An example is blood type.
Hope this helps!
Final answer:
Pleiotropy is the term that describes the ability of a single gene to have multiple phenotypic effects. An example of this is sickle cell anemia, where mutations in a single gene result in various symptoms and health effects.
Explanation:
The term that describes the ability of a single gene to have multiple phenotypic effects is pleiotropy. Pleiotropy can result in multiple, seemingly unrelated physical traits or effects caused by a single allele. A classic example of pleiotropy in humans is the case of sickle cell anemia, where mutations in the hemoglobin B gene not only cause changes in red blood cells but also lead to symptoms such as anemia, pain, and increased risk of infection.
Other terms like incomplete dominance and codominance refer to the expression of two different alleles in the phenotype, while epistasis refers to the interaction of different genes where one gene can mask or modify the effect of another. A trait controlled by more than two alleles is described as having multiple alleles, like the ABO blood group antigens.
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.
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 Larry is taught new information about an elephant, which is a large animal, he will benefit from using ___________ about other large animals to store that new information so he can retrieve that information when he needs it.
Answer:
schemas
Explanation:
If Larry is taught new information about an elephant, which is a large animal, he will benefit from using schemas about other large animals to store that new information so he can retrieve that information when he needs it.
He will benefit from using schemas about other large animals.
Schemas are units of understanding that can be hierarchically categorized as well as webbed into complex relationships with one another.What is the benefit of using Schemas?Schemas can be useful because they allow to take shortcuts in interpreting the vast amount of information that is available in environment. These mental frameworks also cause to exclude pertinent information to focus instead only on things that confirm pre existing beliefs and ideas.
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Why are the male testes located in the scrotum, outside the body? (A) Their external location is necessary for penile development.(B) The testes develop better outside the body.(C) It helps the male secondary sexual characteristics develop.(D) Spermatogenesis is temperature sensitive.
The testes are located in the scrotum outside the body mainly because it requires a cooler temperature for the efficient production of sperm, a process called spermatogenesis.
Explanation:The male testes are located in the scrotum, a pouch outside the body, primarily because of the need for a temperature lower than the body's internal temp for spermatogenesis (the process of sperm production) to occur efficiently. In fact, the optimal temperature for spermatogenesis is about 2-4 degrees Celsius below the body’s average temperature. This is why, when exposed to cold conditions, the scrotal muscles contract to bring the testes closer to the body for warmth, whereas in hotter conditions they relax, allowing the testes to stay cool. Therefore, option (D) is the most accurate.
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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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What types of antigen do T cells NOT recognize? What types of antigen do T cells NOT recognize? self-antigens bacterial antigens cancer antigens processed fragments of protein antigens displayed on surfaces of body cells
Answer:
Self-antigens are not recognized and attacked by the T cells.
Explanation:
In immunology, the antigens are those substances which are bound by the antibodies. The antigens can be originated from within the bodies, known as self antigens or from outside the body, known as non-self antigens. The immune system identifies and attacks non-self invaders or the foreign harmful objects present in the body. It does not attack the self-antigens under the normal conditions. This is due to the negative selection of T cells of the thymus.
T cells, developed in the thymus, recognize antigens through an antigen receptor on their surface. They do not recognize self-antigens, but only processed antigens presented on their surface. This understanding is crucial in dealing with organ transplantation and cancer treatment as T cells discern between self and non-self antigens.
Explanation:They are unable to recognize self-antigens, but only processed antigen displayed on the surface in a major histocompatibility complex molecule. This learning process cultivates tolerance to self-antigens.
There are many functional types of T cells including helper, regulatory, and cytotoxic T cells. Each of these T lymphocytes plays a distinct role in mounting an immune response against foreign bodies and pathogens. Interestingly, T cells do not engage with antigens in the same way as B cells. Unlike T cells, B cells can recognize native, unprocessed antigen and do not need the involvement of MHC molecules and antigen-presenting cells.
In practical terms, the ability of T cells to distinguish between self and non-self antigens is crucial in conditions such as organ transplantation and cancer treatment. For instance, a transplanted organ may be rejected as body's immune system can identify it as foreign due to its non-self antigens. Similarly, in the case of cancer, cellular antigens often change, which enables the immune system to identify and destroy cancerous cells.
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Which part of a seed grows into a root and which plant part acts as a protective covering for a seed during seed dormancy? The part of a seed grows into a root and the acts as a protective covering for a seed during seed dormancy.
Answer:
The part of a seed grows into a root: Radicle
The part that acts as a protective covering for a seed during seed dormancy: Seed coat.
Explanation:
The seed of the plants carries embryo in it. The part of the embryo that serves as the embryonic root is called radicle. Once the conditions become favorable for growth and the seed germinates on suitable substratum, the radicle enlarges and gives rise to roots.
The seed coat is the part of the seed that protects the embryo from any injury during the seed dormancy. The seed coat is derived from the outer most covering, that is integuments of the ovule after fertilization.
Due to its system of nine air sacs connected to the lungs, the respiratory system of birds is arguably the most effective respiratory system of all air-breathers. Upon inhalation, air first flows into posterior air sacs, then into the lungs, and then into anterior air sacs on the way to being exhaled. Thus, there is one-way flow of air through the lungs, along thousands of tubules called parabronchi. If Archaeopteryx had air sacs, then which of its features would have had the opposite effect on enabling Archaeopteryx to fly long distances from that provided by air sacs?
Answer:
The respiratory system of birds is arguably the most effective respiratory system of all air-breathers
the respiratory system of birds is arguably the most effective respiratory system of all air-breathers. Upon inhalation, air first flows into posterior air sacs, then into the lungs, and then into anterior air sacs on the way to being exhaled. Thus, there is one-way flow of air through the lungs, along thousands of tubules called parabronchi.
Explanation:
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.
They are cells which cannot make their own food there are flexible with lots of energy synthesizers they remain active at all times and if needed they could destroyed also identify who I am and illustrate how I look
The possible answer for the given problem is RBC (Red Blood Corpuscles).
Further Explanation:
RBC (Red blood cell) is component of blood that is the most vital component as it carries oxygen and other gases from one part to another part. To be precise it helps in gaseous exchange. This step is most vital because every cell in a body need oxygen to function properly. While the gas mainly carbon dioxide produced as a waste product needs to be eliminated from the body. This function is carried out by hemoglobin a part of RBC. These cells are biconcave in structure as shown in the image attached.
If we consider the given data and its fulfillment for RBC to be the answer we have,
1. Cells that cannot make their own food: RBC is the cell that gets their energy reserves via glycolysis and as they do not have any protein coding DNA they cannot make their own proteins. Thereby they have less lifespan and withers off after the completion of the span.
2. Flexible with lot of energy synthesizers: RBC lack mitochondria thus for getting energy is quite flexible with energy synthesizers.
3. They remain active all time of the day: RBC helps in carrying oxygen to the cells in need. Thus the cells work all time of day even though the body is at rest.
4. They get destroyed: RBC withers to form bilirubin and biliverdin which is a main component that gives color to fecal matter.
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Answer Details:
Grade: High School
Subject: Biology
Chapter: Cell biology
Keywords:
Food, energy synthesizers, RBC, corpuscles, cell, red blood cells, oxygen, carbon dioxide, mitochondria, enucleate cell, blood cells, elimination of waste, gaseous exchange, vital process.
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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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.
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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Goblet cells of the respiratory tract produce a physical barrier called (BLANK)
Real answers please.
I believe the correct answer is mucus.
Explanation:In the respiratory tract, there exist hairs called cilia that ensure anything entering the tract is moved out through a wavelike movement. To assist them, mucus is produced in pits of specific cells called goblet cells.
Further Explanation:The mucus traps dust and other large particles that might cause physical harm to the soft tissue of the linings of the respiratory tract. The mucus starts all the way from the mouth to the nasal cavities, the trachea, bronchi, bronchioles and the lungs. Goblet cells are just but specialized epithelial cells that are usually found in every hollow surface in the body and are non keratinized. These goblet cells are not only found in the respiratory tract but every surface of the gastrointestinal tract. In the stomach, they are very essential since they protect the stomach from corroding itself because it secretes hydrochloric acid that has a pH of 2.3 which is very acidic. It also lubricates the gastrointestinal tract to ensure the smooth movement of food from the mouth to the anus as it is being digested.
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