The chemical molecules making up DNA are
a. organic acids.
b. organic bases.
c. ribosomes.
d. molecular ganglia.
B
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Of the following, which would be the strongest evidence in favor of heritability? a. Dizygotic twins resemble each other more than monozygotic twins do
b. Many aspects of behavior differ, on average, among human cultures. c. Adopted children resemble their adoptive parents more than their biological parents. d. Monozygotic twins reared apart resemble each other in many ways.
The respondent behavior in fear and anxiety problems involves ____________, and the operant behavior involves ____________
a. autonomic nervous system arousal; escape or avoidance behavior b. escape or avoidance behavior; autonomic nervous system arousal c. autonomic nervous system arousal; autonomic nervous system arousal d. escape or avoidance behavior; escape or avoidance behavior
Regarding the repair of the central nervous system, which of the following statements is FALSE?
a. Although animal studies have been conducted, no human trials involving the repair of damaged spinal cords have been undertaken yet. b. Scientists have partially repaired cut spinal cords in rats. c. Currently, a serious injury to the brain or spinal cord is usually permanent. d. Stem cells have been injected into the gap in the spinal cord to form a cellular bridge to repair the damaged spinal cord.
At middle age, there is an apparent decrease in height caused by
A. intervertebral disk degeneration B. decreased thickness of joint cartilage in the lower extremities C. abnormal spinal curvature D. all selections are correct