The E. coli lac operon has ________ operator sequences.

A. one
B. two
C. three
D. four


Answer: C

Biology & Microbiology

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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

Biology & Microbiology

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

Biology & Microbiology

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.

Biology & Microbiology

Mutations only occur in DNA, and never are observed in RNA.

a. true b. false

Biology & Microbiology