Many proto-oncogenes encode ____
a. growth inhibiting factors
b. intracellular receptors
c. tumor suppressor proteins
d. receptors for growth inhibiting factors
e. growth factors
ANSWER: e
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The cell type responsible for type II hypersensitivity is the
A. mast cell. B. B cell. C. macrophage. D. platelet. E. neutrophils.
Carbonic anhydrase in red blood cells:a
removes oxygen from the erythrocyte. b. carries carbon dioxide in the erythrocyte. c. converts carbon dioxide to bicarbonate ion. d. increases the pH of the blood. e. increases the permeability of the capillary to carbon dioxide.
Mutations of the gene for ?-globin
a. are usually lethal. b. occur only at amino acid position 6. c. number in the hundreds. d. always result in sickling of red blood cells. e. can always be detected by gel electrophoresis.
Most Swiss starlings produce four to five eggs in each clutch. Those producing fewer or more than this have reduced fitness. Which of the following terms best describes this?
A) artificial selection B) directional selection C) stabilizing selection D) disruptive selection E) sexual selection