During which stage of meiosis does crossing over occur?

A. anaphase I
B. prophase I
C. prophase II
D. telophase II


Answer: B

Biology & Microbiology

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Cystic fibrosis is most often caused by the CFTR?F508 mutation. This mutation:

A. reduces the function of a chloride ion channel. B. increases ATP binding to chloride. C. is autosomal dominant. D. causes symptoms in carriers.

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Under Hardy-Weinberg equilibrium, which frequency of A yields the highest frequency of aa?

a. 0.8 b. 0.6 c. 0.5 d. 0.4 e. 0.2

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The opening of which of the following is

covered with ciliated, fingerlike projections that produce a sweeping action? a. ovary b. uterus c. vagina d. oviduct e. follicle

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The most effective HIV treatment includes

A. several different protease inhibitors B. several different drugs each directed at different enzymes (reverse transcriptase, integrase, fusion, and protease). C. several different drugs designed to inhibit reverse transcriptase. D. several different fusion inhibitors and reverse transcriptase inhibitors.

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