The E. coli lac operon has ________ operator sequences.
A. one
B. two
C. three
D. four
Answer: C
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Which pattern of diploid and haploid phases reflect the life cycle in plants?
a. alternation between haploid and diploid generations b. two haploid generations followed by a diploid generation c. one haploid generation followed by two diploid generations d. a single generation that limits the haploid state to gametes while the rest of the organism is diploid e. a single generation that limits the diploid state to gametes while the rest of the organism is haploid
If water is abundant, a plant's guard cells will and the stomata will .
A. collapse; open B. collapse; close C. swell; close D. None of the answer choices is correct. E. swell; open
When a moss spore lands on an appropriate site, it germinates into the first stage of the gametophyte called a(n)
A. prothallus. B. archegonium. C. antheridium. D. rhizoid. E. protonema.
Mutations only occur in DNA, and never are observed in RNA.
a. true b. false