According to the trichromatic theory of color vision, three different types of cones supposedly respond to
a) blue, green, and red.
b) blue, red, and yellow.
c) green, red, and yellow.
d) blue, green, and yellow.
ANS: a
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A disorder in which the liver fails to produce a certain enzyme necessary for early brain development is ________
a. Down syndrome b. PKU c. fragile-X syndrome d. Tay Sach's disease
How do lifestyle choices affect physical strength in middle adulthood?
A. Alternating weeks of strenuous physical activity with weeks of sedentary pursuits predicts the slowest loss of physical strength. B. People who maintain a sedentary lifestyle are likely to feel weaker and have more difficulty compensating for loss of strength, compared to those who exercise regularly. C. Being in a long-term relationship is related to more rapid loss of strength over time. D. People who consume large portions of fried red meat on a regular basis tend to maintain their strength longer than people who adopt a vegan diet.