Your grandmother has quite a bit of gray hair. She told you that she first started getting gray hair when she was 52 and it keeps getting grayer each year. What is happening that her hair is getting gray?
a. Gray pigments occur more frequently in older adults.
b. The hair becomes more transparent in old age.
c. Stress creates more gray pigment to appear in older adults.
d. Most people experience loss of pigment that provides hair color.
Answer: D
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In some studies, people with post-traumatic stress disorder (PTSD) appear to have a smaller than normal a. hypothalamus
b. anterior cingulate cortex. c. hippocampus. d. amygdala.
The major drawback of family studies is that:
a. It is difficult to get general population measures on the characteristic in question b. Families that share genes also share environments c. They are costly studies to conduct d. Most people don't want to participate in these studies
The ________ stage of prenatal development begins 8 weeks after conception.
A. embryonic B. germinal C. fetal D. blastocyst
When a pregnancy ends before the developing child is able to survive outside of the mother's womb, this is called
a) artificial insemination. b) spontaneous abortion. c) in vitro fertilization. d) surrogate birth.