All of the following are usually a part of the aging of reproductive systems EXCEPT ____
a. declining levels of estrogen
b. menopause
c. loss of sexual response
d. decreased fertility
e. declining testosterone levels
ANSWER: c
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The polymerase chain reaction is used to duplicate small sections of
A. DNA. B. RNA. C. proteins. D. lipids.
A neuron fires when Na+ ions
A. move down their concentration gradient by the process of facilitated diffusion. B. are actively pumped down their concentration gradient. C. move against their concentration gradient spontaneously. D. are actively pumped against their concentration gradient. E. are released from an internal store.
Lobsters and clams have _____ in common with fishes
a. external gills b. a two-chambered heart c. internal gills d. skin as a respiratory surface e. an open circulatory system
Which drug is used to treat cases of tuberculosis?
A. Vancomycin B. Isoniazid C. Synercid D. Penicillin G E. Tetracycline