Synthesis of neuropeptides differs from that of other neurotransmitters because it:
A. takes place in the axon terminals of neurons.
B. takes place in the cell bodies of neurons.
C. takes place on ribosomes in the postsynaptic cell's membrane.
D. uses amino acids as precursor molecules.
E. only takes place at synapses outside the central nervous system.
B
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Blood from the medial border of the stomach is drained by the
A) celiac trunk. B) gastric vein. C) superior mesenteric vein. D) inferior mesenteric vein. E) inferior vena cava.
The cells responsible for cell-mediated immunity are the _________.
A) B lymphocytes. B) T lymphocytes. C) plasma cells. D) suppressor T lymphocytes.
The endocrine tissues of the reproductive system of the female produce __________.
a. estrogens, inhibin, and progesterone b. FSH and LH c. androgens and estrogens d. all of the listed responses are correct
A substance is added to a protein sample that does not alter the composition or amino acid sequence of the protein itself, but changes its three-dimensional structure. Which of the following was altered by the substance?
A. Hydrogen bonds B. Covalent bonds C. Ionic bonds D. Oxygen double bonds