During the course of evolution, one of the main threats to human survival was ____________. Persons who stood the best chance of survival were those __________.
(a) extreme cold; who were heavier and had a protective layer of body fat
(b) the presence of vegetation that was toxic if eaten; who ate only meat
(c) inconsistent food supplies; who preferred high-calorie foods
(d) animal predators; who were lean and could ambulate quickly
(c) inconsistent food supplies; who preferred high-calorie foods
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Which of the following is most likely to result in a nonfunctional polypeptide?
A. a silent mutation B. a missense mutation C. a nonsense mutation D. a transition mutation E. Silent and missense mutations are the most likely to result in a nonfunctional polypeptide.
In an antagonistic muscle pair:
A. one muscle undergoes flexion, whereas the other undergoes extension. B. both muscles undergo flexion simultaneously. C. both muscles undergo extension simultaneously. D. the two muscles combine forces to produce similar motions. E. None of the answer options is correct.
What activity of Pol I makes it uniquely suited for its role in bacterial DNA replication?
What will be an ideal response?
The presence of a loop of Henle in nephrons is an evolutionary adaptation that enables mammals and birds to reabsorb water efficiently and produce a ________ urine.
A. hypertonic B. hypotonic C. isotonic D. osmolar