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
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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
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
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
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).