In a certain species of salmon, some adult males are extremely large whereas other adult males are very small, compared to the females. There are no intermediate-sized adult males in the population. This is probably the result of

A) directional selection. B) artificial selection.
C) disruptive selection. D) stabilizing selection.


C

Biology & Microbiology

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Air movement to the mammalian respiratory surfaces can be reduced when smooth muscle in the walls

of the ____ contract(s).

a. epiglottis b. bronchioles c. large bronchi d. trachea e. aorta

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Which hypothesis of aging involves mitochondria?

A. gene damage by free radicals B. external factors C. extrinsic factors D. whole-body process E. damage accumulation

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Birds and mammals have a more active lifestyle than reptiles due to

A) insulation over their body surface. B) internal fertilization. C) a slower metabolism. D) internal fertilization and a high, constant body temperature. E) a high, constant body temperature and insulation over their body surface.

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Who discovered penicillin?

A) Fleming B) Ehrlich C) Kitasato D) Pasteur E) Domagk

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