The first step in the process of photoreception is
A) the bleaching of rods.
B) the bleaching of cones.
C) absorption of a photon by a visual pigment.
D) inhibition of the sodium pumps.
E) release of neurotransmitter.
Answer: C
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An EEG with waves of high amplitude and low frequency is descriptive of or occurs during
A. neither slow-wave sleep nor paradoxical sleep. B. slow-wave sleep. C. both slow-wave sleep and paradoxical sleep. D. paradoxical sleep.
The thymus is the only lymphoid organ that does not:
A) have lymphocytes B) produce hormones C) have a cortex and medulla D) directly fight antigens
Molecules with the same atoms, in the same sequence, but arranged differently in space are called ________.
A. functional groups B. structural isomers C. aromatic molecules D. stereoisomers
The ovaries release estrogen and progesterone in response to gonadotropic hormones from the anterior pituitary gland
Indicate whether the statement is true or false