Water reabsorption into the capillaries associated
with a nephron is achieved principally by
a. bulk flow.
b. active transport and osmosis.
c. countercurrent multiplication.
d. phagocytosis.
e. all of these.
Answer: b
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During radioactive decay, the nucleus of an atom ________
a. disintegrates, releasing particles and energy b. captures an unclaimed proton c. transposes its neutrons and electrons d. converts from a relatively stable to an unstable form
Which of the following statements concerning enzymes is FALSE?
a. Each enzyme has an optimal temperature. b. Each enzyme has an optimal pH. c. Most enzymes are highly specific. d. Some enzymes require cofactors. e. Most enzymes are RNA molecules
Which of the following is/are TRUE regarding "REM sleep"?
a. "dreaming" occurs during REM sleep b. Atonia occurs during REM sleep c. ACh levels are reduced during REM sleep d. all of the above e. a and b
Most of the oxygen in human blood is:
A) carried in the plasma membrane of red blood cells. B) dissolved in the plasma. C) carried in hemoglobin. D) carried on albumin.