Which birth control method prevents sperm from exiting the male’s body?

a. rhythm method
b. withdrawal
c. vasectomy
d. tubal ligation
e. condom


ANSWER: c

Biology & Microbiology

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Pheromones are ____ signals

a. tactile b. electrical c. acoustical d. visual e. chemical

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Which of the following describes a prion?

a. enveloped viral particle with double-stranded DNA enclosed by a capsid b. infectious RNA particle c. infectious proteinaceous particle with no associated nucleic acids d. a simple prokaryote with only a membrane and a nucleoid region

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Four of the following have been an important influence on the evolution of mammals. Which one is the exception?

a. continental movement b. teeth c. competition between species d. decline of the dinosaurs e. geographic isolation

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Please choose the class of chemical agents to which quaternary ammonium compounds belong.

A) Detergents B) Oxidizing agents C) Halogens D) Phenolics E) Aldehydes

Biology & Microbiology