During a stressful interval, _____
A) thyroid-stimulating hormaon (TSH) stimulates the adrenal cortex and medulla to secrete acetylcholine
B) the alpha cells of islets secrete insulin and simultaneously the beta cells of the islets secrete glucagon
C) adrenocorticotropic hormone (ACTH) stimulates the adrenal cortex, and neurons of the sympathetic nervous system stimulate the adrenal medulla
D) the posterior pituitary gland secretes more growth hormones
E) the calcium levels in the blood are increased due to actions of two antagonistic hormones, epinephrine and norepinephrine
Answer: C
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Which of the following is NOT part of the structure of the nucleosome core particle?
A. It is composed of an octamer of proteins. B. There is a linker region between two nucleosomes of about 200 base pairs. C. There are two copies each of H2A, H2B, H3 and H4. D. The DNA is wrapped around the core slightly over two complete turns E. The DNA wrapped around the core contains 146-147 base pairs.
Choose the receptor that is NOT correctly matched with its function.
A. proprioceptor - monitors stretch of muscle fibers B. baroreceptor - monitors hydrostatic pressure in blood vessels C. nociceptor - transmits signals that the brain interprets as pain D. chemoreceptor - perceives taste and smell stimuli E. peripheral chemoreceptor - monitors the pH of the cerebrospinal fluid
If the blood brain barrier prevents toxic substances from getting into the central nervous system, how does alcohol
most likely impair a person's judgment?
a. alcohol acts on the peripheral nervous system, which then activates neurons in the cortex that impair judgment b. alcohol acts on the liver, creating toxins that can cross the blood brain barrier, which then activate neurons in the cortex that impair judgment
c. alcohol decreases blood oxygen levels, which leads to impaired judgment d. alcohol can bind to glucocorticoid transporters in the brain, which causes impaired judgment by binding to neurons in the cortex e. because it is hydrophobic, alcohol can pass directly across the blood brain barrier and cause impaired judgment by binding directly to neurons in the cortex
In a DNA molecule, the amount of adenine equals the amount of ____
a. guanine b. thymine c. cytosine d. uracil e. tyrosine