The developing gonads of a 5-week-old fetus with XY chromosomes would show:
A. a clearly defined scrotum and penis.
B. a clearly defined Wolffian duct system.
C. gonads that are not differentiated for a female or male.
D. clearly defined ovaries.
Answer: C
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Who is most likely to give birth to low-birth-weight infants?
a. Samantha, who is carrying a set of identical twins b. Carlotta, who is carrying a set of fraternal twins c. Daniela, who is carrying a single fetus d. Fredrica, who is carrying triplets
One of the influences that has been associated with the development of borderline personality disorder is a. a history of child abuse or neglect
b. a developmental delay for major milestones (i.e., walking, talking). c. parental alcoholism. d. deficits in neurotransmitter circuits involving dopamine.
In an experiment, a researcher manipulates the dependent variable in order to observe whether the behavior measured by the independent variable changes
Indicate whether the statement is true or false
Which statement about sleep is TRUE?
A) Newborns sleep less than do the elderly. B) REM sleep is most pronounced in the first 30 minutes of sleep. C) Over the course of a night, we usually sleep 2 hours for every hour that we had been awake. D) We sleep less per night as we age.