Most of the active functions of plasma membranes are carried out by ____

a. cholesterol
b. proteins
c. hydrophilic heads
d. hydrophobic tails
e. carbohydrates


ANSWER: b

Biology & Microbiology

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Transport proteins _____

a. are found only in eukaryotic cells b. allow only small molecules and ions to cross the membrane c. are required for small nonpolar molecules to cross the membrane d. allow ions and polar molecules to cross the membrane e. are peripheral membrane proteins

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The resting membrane potential is indicated by

a. A. b. B. c. C. d. D. e. E.

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A_____ infection is an infection that occurs as a complication of a pre-existing one

Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology

A relationship in which two species intereact and

both benefit is a. neutral. b. commensalism. c. competitive exclusion. d. mutualism. e. parasitism.

Biology & Microbiology