Plasma membranes and some internal membranes have which of the following proteins, which trigger a change in the cell's activities in response to a stimulus?
A. Receptor proteins
B. Transport proteins
C. Adhesion proteins
D. Transmembrane proteins
E. Peripheral proteins
Answer: A
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The movement of potassium out of a resting neuron is a consequence of:
A. the electrical gradient across the membrane. B. the high concentration of potassium inside the cell. C. the presence of potassium leak channels in the membrane. D. the high concentration of potassium inside the cell AND the presence of potassium leak channels in the membrane.
The anterior pituitary secretes FSH and LH in response to the releaser ________
a. testosterone b. melatonin c. gonadotropin-releasing hormone (GnRH) d. estrogen
The most reasonable method of limiting human population growth is
a. increasing carrying capacity. b. decreasing birth rate. c. decreasing competition. d. increasing death rate. e. exploiting outer space.
Refer to the accompanying figure. The labeled structure that is responsible for secondary growth is:
a. outer bark b. inner bark c. wood d. bark e. vascular cambium