Most atmospheric carbon is in the form of
a. carbon dioxide.
b. carbon monoxide.
c. hydrocarbons.
d. carbon tetrachloride.
e. carbonic acid.
A
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Generally, which phase of the cell cycle varies the most in length?
a. G1 b. S c. G2 d. M e. All phases are the same length among cells
Which type of selection tends to increase genetic variation?
A. Disruptive selection B. Stabilizing selection C. Directional selection
A site of negative genetic regulation where binding by repressor blocks transcription is the
A. operon. B. CAP. C. promoter. D. operator. E. repressor.
Although symbiotic relationships between nitrogen-fixing bacteria and plants are rare, many plants have symbiotic relationships with
A. filamentous algae. B. mycorrhizal fungi in the soil. C. nematode worms in the soil. D. other plants. E. soil insects.