What is the primary function of the hormone ADH?
A. Regulates biological rhythms
B. Conserves water by stimulating its reabsorption from urine
C. Inhibits loss of calcium from bone
D. Mediates adaptation to long term stress
E. Stimulates bone breakdown
Answer: B
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Which of the following is the primary advantage of C4 plants over C3 plants?
A. C4 plants minimize photorespiration compared with C3 plants. B. C4 plants can produce sugars more efficiently than C3 plants under hot, arid conditions. C. C4 plants can produce CO2 needed for sugar production in the Calvin cycle more efficiently than C3 plants. D. Relative to C3 plants, C4 plants can keep their stomata closed more frequently to limit water evaporation, yet can still produce significant CO2 needed for sugar production. E. All of the choices are correct.
Direct penetration of which of the following worms results in tissue damage at the site of attachment, blood loss, and an acute gastrointestinal phase demonstrated by an increased eosi-nophilia?
a. Whipworm b. Pinworm c. Threadworm d. Hookworm
The rapid diversification of species seen in the fossil record followed by long periods of stasis is part of the ________ model of evolution.
A. symmetric B. spatial C. punctuated equilibrium D. graduated
After several years of drought, the beak sizes of the medium ground finches were on average, larger than they had been in previous generations. What kind of natural selection occurred?
a) sexual b) disruptive c) balancing d) directional