Homologous chromosomes may swap segments of genetic information during which phase of meiosis?
a. metaphase I
b. metaphase II
c. prophase I
d. prophase II
e. anaphase I
ANSWER: c
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Which sequence of events is true about phtyochrome?
A. Red light activates phytochrome, converting it to Pfr, activated Pfr moves to the nucleus, then Pr is a receptor for red light in the cytosol. B. Pr is a receptor for red light in the cytosol, red light activates phytochrome, converting it to Pfr, then activated Pfr moves to the nucleus. C. Pr is a receptor for red light in the cytosol, activated Pfr moves to the nucleus, then red light activates phytochrome, converting it to Pfr.
Which of the following are adaptations of fluid feeders that feed on the blood of other
animals?
a. piercing and sucking mouthparts b. production of anesthetic compounds c. production of anticoagulants d. all of these
Cactus leaves are modified as trichomes
a. True b. False
Molecules and ions reabsorbed from the nephron reenter the blood at the
a. efferent arteriole. b. peritubular capillaries. c. renal artery. d. afferent arteriole. e. glomerulus.