After a nerve impulse occurs, the neuron is temporarily less likely to fire because
a. the cell is still above its resting level.
b. potassium ions flow out of the neuron while the membrane gates are open.
c. acetylcholine acts as an inhibitor.
d. a positive after-potential has occurred.
ANSWER: b
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An operational definition specifies the meaning of a variable in terms
a. of the methods that are used in measuring or manipulating that variable. b. that are agreed upon by all of the major researchers in the area of research. c. that are quantitative and statistically derived. d. of the historical discoveries throughout all of science.
Examination of tests such as the WAIS and WISC-R have found that white males are more often depicted in test items than other groups. What has research shown about such differences?
a. No one has established that these differences affect test performance. b. They have a greater impact on females than on males. c. They have a substantial impact on younger children but little impact on adults. d. They account for a large percentage of test score differences.