Which Statement Does NOT Describe a Process by Which the Specificity

question 7

Multiple Choice

Which statement does NOT describe a process by which the specificity of aquaporins is ensured?

• A) The channel contains a negatively charged Asp residue to scavenge protons and H₃O⁺.
• B) The diameter of the channel narrows to 2.8 Å.
• C) There are carbonyl backbone residues in the channel that hydrogen bond with water.
• D) Arg and His residues in the channel repel protons and H₃O⁺.
• E) Electric dipoles of short \(\alpha\) helices repel protons and H₃O⁺.

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