An enzyme is
A) the genetic material.
B) a protein that promotes metabolic reactions by slowing reactions that are too fast.
C) a molecule, usually a protein, that speeds the rate of a biochemical reaction by
lowering the activation energy.
D) usually a vitamin.
C
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What will be an ideal response?
Identify the true statement(s)
a. Slow-wave sleep occupies a greater percentage of time than paradoxical sleep. b. It is harder to fall asleep when fully awake than to stay awake when sleepy. c. Slow-wave sleep is characterized by frequent shifts in body position. d. Sleep-on neurons in the slow-wave sleep center bring on sleep. e. All of the above
Which of the following is NOT a stimulus for various mechanoreceptors?
A. Deep pressure B. Cold temperature C. Vibration D. Stretch E. Light touch
Pyrogens are
A. medicines taken for immune disorders. B. phagocytic cells that engulf pathogens. C. plasma proteins that bind to antigens. D. tissue chemicals that initiate a fever.