Polar Molecules Cannot Easily Pass Through the Cell Membrane, but Hydrophobic

question 42

Multiple Choice

Polar molecules cannot easily pass through the cell membrane, but hydrophobic molecules can easily pass through the membrane. The two molecules shown in the diagram both have effects that include raising blood pressure. Comparing two molecules to the right, which statement is TRUE?

• A) Ephedrine can more easily pass through the cell membrane than epinephrine.
• B) Epinephrine can more easily pass through the cell membrane than ephedrine.
• C) Both epinephrine and ephedrine can pass through the cell membrane equally well.
• D) Neither epinephrine nor ephedrine can pass through the cell membrane.
• E) None of the statements is true.

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