Because DNA replication takes place at an extremely rapid rate, a cell must repair breaks in a strand of DNA up to approximately how many times in an hour?

a. ?200,000
b. ?1,000
c. ?10
d. ?2,000,000
e. ?10,000


Answer: d. ?2,000,000

Biology & Microbiology

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A pure-breeding population of a __________ trait is easier to establish from a mixed population.

Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology

What event will increase the frequency of a

mutation in a population over time?

a. fitness b. natural selection c. artificial selection d. adaptive radiation e. none of these

Biology & Microbiology

Refer to the accompanying figure. Which of the following hormones is secreted by the adrenal cortex?

a. 1 b. 2 c. 4 d. 6 e. 8

Biology & Microbiology

The interrelationships between the endocrine and the nervous systems are especially apparent in a _____

A) steroid-producing cell in the adrenal cortex B) neurosecretory cell in the hypothalamus C) brain cell in the cerebral cortex D) cell in the pancreas that produces digestive enzymes

Biology & Microbiology