A chemical substance that behaves as a natural

analgesic is
a. an amphetamine.
b. LSD.
c. epinephrine.
d. an endorphin.
e. none of these.


Answer: d

Biology & Microbiology

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An interaction in which one species benefits

and the second species is neither harmed nor benefited is a. mutualism. b. parasitism. c. commensalism. d. competition. e. predation.

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HIV is the virus that causes AIDS. In the mid-1990s, researchers discovered an enzyme in HIV called protease. Once the enzyme's structure was known, researchers began looking for drugs that would fit into the active site and block it

If this strategy for stopping HIV infections were successful, it would be an example of what phenomenon? A) vaccination B) denaturation C) allosteric regulation D) competitive inhibition

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Commercially grown mushrooms are members of which of the following?

A. Ascomycetes B. Basidiomycetes C. Glomeromycetes D. Chytrids E. Zygomycetes

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The face of a sunflower turns to follow the sun as it moves across the sky. This is an example of

A. homeostasis. B. reproduction. C. metabolism. D. response to stimuli. E. development.

Biology & Microbiology