Place the following events of mitosis in the correct order.
I. Sister chromatids align on the metaphase plate.
II. The cleavage furrow forms.
III. The nuclear membrane breaks up.
IV. Sister chromatids condense.
V. Sister chromatids separate.
A. I, II, III, IV, V
B. III, IV, I, V, II
C. IV, III, I, V, II
D. III, II, I, IV, V
E. IV, I, III, V, II
C. IV, III, I, V, II
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Collagen _____
A. functions inside a cell. B. is part of a cell wall. C. must be secreted from a cell. D. forms junctions between cells. E. acts as an enzyme.
What would be the effects of the accidental seepage of fungicide into the soils surrounding a plant in a mycorrhizal relationship?
a. The plant would die. b. The plant's water and mineral supply would slow down. c. The plant's leaves would become yellow. d. There would be no change in the plant. e. The plant would lose its nitrogen-fixing partner.
In humans, an X-linked disorder called coloboma iridia (a fissure in the iris) is a recessive trait. A normal couple has an afflicted daughter. What would be the most plausible scenario for this situation?
A. The mother carries two recessive alleles. B. The father carries one recessive allele, and the mother carries one recessive allele. C. The female is not the biological mother, but the male is the biological father. D. The male is not the biological father, but the female is the biological mother. E. Both parents are heterozygous for the trait.
A person is infected with HIV. The individual is treated with several drugs, including azidothymidine (AZT). Which of the following is the most immediate effect of this drug?
A. It allows reverse transcriptase to proofread, and this will allow successful treatment with a vaccine. B. It does not allow the viral genome to become integrated into the host genome. C. It does not allow the virus to make a DNA copy of its genome. D. It inhibits formation of the capsid. E. It inhibits budding, as it is the reverse of the process by which HIV enters a cell.