Question

Why does the cell surface membrane not provide a barrier to the entry of hydrophobic molecules into the cell?

Answer 1

$\color{green}{ANSWER}$

⭐The plasma membrane is selectively permeable; hydrophobic molecules and small polar molecules can diffuse through the lipid layer, but ions and large polar molecules cannot.

⭐Integral membrane proteins enable ions and large polar molecules to pass through the membrane by passive or active transport.

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