The action of nonsteroid hormones often results in conversion of ATP to cyclic AMP, which then functions
A) as an internal receptor for steroid hormones.
B) as an enzyme in the generation of ATP.
C) to initiate a cascade of enzyme activations.
D) to stimulate the release of the original hormone from the cell surface receptor.
E) as a secondary hormone released into the bloodstream.
C
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The substances that donate electrons to the electron transport chains of chemolithotrophs are ________.
A. lipids B. carbohydrates C. inorganic compounds D. methane gas and alcohols
Excess body fat increases the risk of
A. high blood pressure. B. diabetes. C. cancer. D. heart disease. E. All of the answers for this question are correct.
The longer the light remained lit, the greater the cost of thermoregulation.
a. true b. false
If Na+ channels are opened in a cell that was previously at rest, how will the resting membrane potential be affected?
(a) The membrane potential is not affected by Na+. (b) It becomes more negative. (c) It becomes more positive. (d) It is permanently reset.