You're researching a steroid hormone that binds to a receptor inside the cell. Once the receptor binds to its hormone, the receptor moves into the nucleus of the cell. The result of hormone-receptor binding is that new mRNA molecules are made. The receptor is also a
A. splicosome.
B. ribosome.
C. tRNA molecule.
D. promoter.
E. transcription factor.
Answer: E
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Which of the following would most likely control an increase in gastric activity?
A) Parasympathetic nervous system B) Hypothalamus C) Medulla Oblongata D) Sympathetic nervous system
In order to be able to respond to the vast number of antigens present in the environment, which the body might encounter, the lymphoid system has populations of cells with ________.
Fill in the blank(s) with the appropriate word(s).
Secretion of insulin causes
A) a decrease in the permeability of cell membranes to glucose. B) an increase in the breakdown of glycogen to release glucose. C) an increase in the concentration of blood glucose. D) a decrease in the concentration of blood glucose.
At the peak of an action potential,
a. the diffusion of Na+ through voltage-gated channels ceases b. the concentration gradient for K+ promotes the movement of this ion out of the cell c. K+ permeability greatly increases d. the electrical gradient promotes the diffusion of K+ out of the cell e. all of the above are true