The condition known as seasonal affective disorder (SAD) may be caused by
A) increased levels of melanin.
B) increased levels of melatonin.
C) increased levels of melanocyte-stimulating hormone.
D) increased levels of gonadotrophins.
E) decreased levels of testosterone.
B
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Which of the following types of RNA contains regions that act as a switch to turn protein synthesis on and off for the protein they code for?
A)microRNA B)riboswitches C)antisense RNA D)tRNA
Contraceptive pills mimic the ________ feedback effect of ________.
A. negative; estrogens and progesterone B. positive; estrogens and progesterone C. positive; FSH and LH D. negative; FSH and LH E. negative; human chorionic gonadotropin (HCG)
The second cervical vertebra is called the
A) primum. B) atlas. C) axis. D) cervix. E) apex.
Which of the following is the main factor that determines body fluid volume?
a) Thirst center b) Fluid balance c) Urinary salt loss d) Compartmentalizing e) None of these choices