Cellular pH is kept near a value of 7 by the
action of
a. salts.
b. buffers.
c. acids.
d. bases.
e. water.
B
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Which of the following is not a method of heat sterilization?
A. Autoclaving B. Incineration C. Heating in a dry air oven D. Pasteurization
The actions of insulin and glucagon are
a. synergistic. b. antagonistic. c. cooperative. d. permissive. e. mutualistic.
The overall efficiency of aerobic respiration in eukaryotes is approximately
A) 10%. B) 25%. C) 55%. D) 75%. E) 100%.
Which of the following statements about the two strands of a DNA molecule is true?
A) The strands are connected to each other by sugar-phosphate bonds. B) The strands are a pair of sister chromatids. C) The strands have identical base sequences. D) An A base on one strand always pairs with a G base on the other strand. E) A T base on one strand always pairs with an A base on the other strand.