The only molecules that can pass freely through the plasma membrane are ones that

A) are positively charged.
B) are small and hydrophobic.
C) are ones that are polar.
D) are small and polar.
E) are small and negatively charged.


Ans: B) are small and hydrophobic.

Biology & Microbiology

You might also like to view...

Meiosis typically results in the production of

a. two diploid cells. b. four diploid cells. c. four haploid cells. d. two haploid cells. e. one triploid cell.

Biology & Microbiology

Select all substances that are known to undergo tubular secretion (from the blood into the tubular fluid).

Biology & Microbiology

Which hormone shuts down HCl secretion?

a. gastrin b. somatostatin c. leptin d. ghrelin e. secretin

Biology & Microbiology

The fiber in your diet is actually

A) cellulose. B) ATP. C) starch. D) protein. E) glycogen.

Biology & Microbiology