When rods are in the dark, cyclic guanosine monophosphate (cGMP) keeps sodium channels _________ allowing sodium to _________ the cell.
A. open; enter
B. open; leave
C. closed; enter
D. closed; leave
Answer: A
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A deepening of the voice in boys usually occurs
a. before the start of the growth spurt. b. at about the midpoint of the growth spurt. c. at age 19. d. at the same time in all boys.
An experiment is externally valid if:
a. the outcome can be attributed to the independent variable only. b. the results generalize to other settings. c. the results are attributed only to external variables. d. there are no alternative explanations of the findings.
Chinese parents' highly authoritarian parenting style, in which they rarely seek their children's opinions, consider their wishes, or offer them alternatives is
a. a form of maltreatment. b. similar to the parenting styles experienced by successful children in the U.S. c. applicable to Western ideals as well as Chinese ideals. d. a loving and caring approach to childrearing that is well suited to their culture.
The frail elderly are those who are infirm, very ill, or cognitively impaired
Indicate whether this statement is true or false.