Compared with segments of unmyelinated axon membrane, channels at a node of Ranvier are
A. about the same density.
B. about half the density.
C. approximately twice as dense.
D. approximately 10 times as dense.
Answer: D
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The purpose of the Human Genome Project was to
a. map the sequence of strands of DNA in human chromosomes. b. determine how many different bases were contained in human DNA. c. identify the "double helix" shape of DNA. d. verify the existence of dominant genes.
Which of the following statistical facts provides support for a role of prenatal androgen levels in lateralization?
a. lower rates of verbal learning disabilities among males b. higher rates of immune disorders among females c. lower rates of left-handedness among males exposed prenatally to ultrasound d. higher rates of left-handedness among males
According to the ____ model of social support, social support moderates the effects of stress—that is, it lessens the negative effects of exposure to stressors (i.e., it serves as a shock absorber). This model predicts that social support is beneficial only under stressful conditions (when shock absorbers are most needed)
a. direct effect c. direct buffer b. stress buffer d. stress effect
If an artist were to blend red, green, and blue paints together, the result would look _________
a) like nonspectral colors b) black c) like white light d) complementary