What are the non-coding segments of DNA called?

a. introns
b. exons
c. promoters
d. transcription factors
e. knockouts


ANSWER: a

Biology & Microbiology

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Which period is the most recent?

a. Triassic b. Silurian c. Devonian d. Permian e. Cambrian

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Environmental resistance is

A) a factor that decreases both death rates and birth rates. B) limits imposed on population growth by only the nonliving environment. C) limits imposed on population growth by only the living environment (e.g., predators or competitors). D) a factor that increases both death rates and birth rates. E) limits imposed on population growth by both the living and nonliving environments.

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