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
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Select all substances that are known to undergo tubular secretion (from the blood into the tubular fluid).
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Which hormone shuts down HCl secretion?
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Biology & Microbiology
The fiber in your diet is actually
A) cellulose. B) ATP. C) starch. D) protein. E) glycogen.
Biology & Microbiology