Sterilization, in which sperm are surgically prevented from reaching the egg, is accomplished by

A) the rhythm method.
B) tubal ligation or vasectomy.
C) spermicide.
D) mifepristone (RU486).


Answer: B

Biology & Microbiology

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Compared to plants from other environments, the cells of many desert plants contain high concentrations of solutes

This helps them survive in their arid surroundings because the high solute concentrations create relatively _____, which help reduce water loss. A) low solute potentials B) high pressure potentials C) low pressure potentials D) high solute potentials

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A. can target the immunogen for destruction. B. can bind to an immunogen. C. are part of the nonspecific immune response. D. both can bind to an immunogen and can target the immunogen for destruction. E. both can bind to an immunogen and are part of the nonspecific immune response.

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Which of the following sequences is correct?

a. receptors >>> sensory neurons >>> motor neurons >>> interneurons b. sensory neurons >>> receptors >>> motor neurons c. motor neurons >>> integrators >>> sensory neurons d. receptors >>> motor neurons >>> interneurons >>> sensory neurons e. sensory neurons >>> interneurons >>> motor neurons

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