This molecule CANNOT freely cross biological membranes: A) O₂ B) CO₂ C) NH₄⁺ D) all of the above E) none of the above

Name: This molecule CANNOT freely cross biological membranes: A) O 2 B) CO 2 C) NH 4 + D) all of the above E) none of the above
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Question

Quizplus · Accepted Answer

C) NH₄⁺ represents a charged molecule (ammonium ion), which cannot freely cross biological membranes due to the hydrophobic nature of the membrane's interior. Charged molecules require specific transport mechanisms to cross membranes.

This Molecule CANNOT Freely Cross Biological Membranes