AP Biologyeasymcq1 pt
What makes the plasma membrane selectively permeable?
A.Its hydrophobic interior blocks polar and charged solutes
B.Its pores open for every molecule
C.It has no proteins
D.It is made of cellulose
Explanation
Core Concept
The fatty-acid core admits small nonpolar molecules but excludes ions and polar solutes unless specific transport proteins are present — the basis of selective permeability.
Correct Answer
AIts hydrophobic interior blocks polar and charged solutes
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