Most codons specify a(n) _____
a. protein
b. polypeptide
c. amino acid
d. mRNA
C
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Mature human sperm and ova are similar in that they _____
A) both have the same number of chromosomes B) are approximately the same size C) each have a flagellum that provides motility D) are produced from puberty until death E) are formed before birth
Cortisol
a. induces liver cells to convert glycogen to glucose. b. suppresses the uptake of glucose by muscle cells. c. induces the breakdown of fats in adipose tissue and of proteins in muscle cells. d. indirectly helps to keep adequate glucose available for brain activity. e. does all of these.
The coronary arteries that bring blood to the heart branch off from the:
A) aorta. B) pulmonary artery. C) vena cava. D) pulmonary vein.
Cells may enter stationary phase because of ________.
A. the accumulation of toxic waste products B. a lack of available oxygen C. the depletion of an essential nutrient D. All of the choices are correct.