AP Biologyeasymcq1 pt
Which molecules cross a phospholipid bilayer most easily by simple diffusion?
A.Small nonpolar molecules like O₂
B.Sodium ions
C.Glucose
D.Large proteins
Explanation
Core Concept
Oxygen dissolves in the hydrophobic core and slips through without help. Ions and large polar molecules cannot cross the nonpolar interior and need proteins.
Correct Answer
ASmall nonpolar molecules like O₂
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