Which of the following is an excitatory neurotransmitter in the brain?
A. Gamma-aminobutyric acid (GABA)
B. Aspartate
C. Glutamate
D. Glycine
E. Lipofuscin
C. Glutamate
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Which of the following is NOT a general category of cell signaling molecules?
A. Endocrine signaling B. Paracrine signaling C. Synaptic signaling D. Enzymatic signaling
An infant born with a genetic defect that causes little or no brown fat to be formed will have
A. difficulty absorbing nutrients from the intestine. B. very stretchy tendons. C. difficulty breathing. D. a reduced bone mass. E. difficulty regulating his body temperature.
Which blood vessel has the thickest layer of smooth muscle?
A) Capillary B) Artery C) Arteriole D) Vein
The aggregation of crystallin proteins in the lens produces ________.
A. myopia B. cataracts C. glaucoma D. astigmatism