A homeotic gene
A) determines which end of the egg will become the head and which end will become the tail.
B) serves as a master control gene that functions during embryonic development by controlling the developmental fate of groups of cells.
C) represses gene transcription and promotes mRNA translation.
D) is found only in adult somatic cells.
Answer: B
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In males, testosterone (select all correct choices):
A. directs the development of male reproductive structures during embryogenesis. B. directs development of male secondary sexual characters during puberty. C. helps maintain adult health. D. acts on Sertoli cells. E. acts on Leydig cells.
What causes antigenic variation?
A. gene mutation B. differential gene expression C. genetic rearrangement D. All of the answer options are correct.
Viruses travel through animals mainly by lysing cells and then spreading to other cells. Plant cells are not easily lysed. If a pathogen enters a plant cell and does not initiate a hypersensitive response, what is the most likely way the virus would spread to other plant cells?
A. Through the chloroplasts. B. Directly through the cell wall. C. Through the central vacuole. D. Through the plasmodesmata. E. Through transport vesicles. Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? · What key words does the question contain and what do they mean? Gather Content · What do you already know about how plant viruses spread between cells? How does it relate to the question? Consider Possibilities · What other information is related to the question? Which information is most useful? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
What causes the disease tuberculosis?
A) a particular type of virus B) a particular type of bacteria C) exposure to polluted air D) genetics