The carcinogen known to cause the most cases and types of cancer is
A) X-rays.
B) ultraviolet light.
C) alcohol.
D) tobacco.
Answer: D
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Muscle fibers generate maximum force:
A. at intermediate lengths. B. when pulled to long lengths before contraction. C. when contracting at short lengths. D. when the myosin filaments contact the Z discs. E. when the overlap between actin and myosin is minimal.
In which of the following structures does fertilization typically take place?
A. fallopian tubes B. ovaries C. uterus D. cervix E. vagina
How many subunits make up a functional ribosome?
a. 1 b. 2 c. 3 d. 4
A reasonable estimation of the duration of an action potential is
a. approximately five microseconds. b. approximately five milliseconds. c. approximately five centiseconds. d. approximately five seconds. e. approximately five nanoseconds.