Which action is LEAST likely to reduce cancer risk?
a. restricting alcohol intake
b. beginning estrogen replacement therapy after menopause
c. maintaining a desirable weight
d. avoiding tobacco
e. avoiding direct sun exposure
ANSWER: b
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Homo erectus and the modern humans differ in
A. social behavior. B. living as tribes. C. their brain size. D. their upright posture. E. opposable thumbs.
Monoclonal antibodies are produced by fusing a
A) B cell and a cancer cell. B) B cell and a T cell. C) mast cell and a macrophage. D) T cell and a plasma cell.
What happens when a round cell expands in diameter?
a. Its surface area and diameter increase with the cube of its diameter. b. Its surface area and diameter increase with the square of its diameter. c. Its volume increases faster than its surface area does. d. Its surface area increases faster than its volume does. e. Its volume and surface area expand by the same proportion.
A solution with a pH of 8 has how many times fewer
hydrogen ions than a solution with a pH of 6? a. 2 b. 4 c. 10 d. 100 e. 1,000