End-product inhibition describes the process whereby
A) decreasing amounts of product reduce activity of the enzyme.
B) decreasing amounts of substrate reduce activity of the enzyme.
C) increasing amounts of product reduce activity of all enzymes in the vicinity.
D) increasing amounts of product reduce activity of the enzyme.
E) increasing amounts of substrate reduce activity of the enzyme.
D) increasing amounts of product reduce activity of the enzyme.
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Spermatozoa may remain viable in the female reproductive tract for as long as
A. 24 hours. B. 48 hours. C. 72 hours. D. 96 hours. E. 144 hours.
A protein is found in blood that is produced by the pancreas and acts on receptors of cells in the liver. What type of physiological regulator is it most likely to be?
A. An autocrine signal B. A neurotransmitter C. An enzyme D. A hormone E. A paracrine signal
The phase of mitosis that begins as spindle fibers pull sister chromatids apart at the centromere is
A. metaphase. B. anaphase. C. interphase. D. telophase. E. prophase.
Quiet expiration requires the ________.
A. contraction of the diaphragm and the external intercostals only B. relaxation of all the respiratory muscles C. contraction of the diaphragm and the internal intercostals only D. contraction of the diaphragm only