Once human nerve cells become mature, they normally exit the cell cycle and remain in ____
a. G0
b. G1
c. G2
d. S phase
e. prophase
A
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The light-independent reactions of photosynthesis are those that
A. convert glucose into energy. B. convert chlorophylls into light energy. C. convert water into hydrogen and oxygen. D. convert CO2 into reduced molecules (sugars). E. occur only at night.
Crossing over
a. increases variability in gametes. b. results in only one exchange per homologue. c. occurs between sister chromatids. d. prevents genetic recombination. e. is followed immediately by separation of each of the chromatids.
Relative to overall body mass, which human organ is the largest of that in any animal?
a. liver b. stomach c. heart d. brain e. large intestine
Which of the following statements is INCORRECT for an X-linked recessive trait in humans?
a) Affected men often have phenotypically normal parents. b) All sons of affected women will be affected. c) Affected women always have an affected mother. d) Affected men have a mother who carries the recessive allele.