In the Potassium Ion Channel, Which of the Following Is

question 20

Multiple Choice

In the potassium ion channel, which of the following is critical in the function of the selectivity filter?

• A) The K⁺ binds to a critical Glu residue.
• B) The K⁺ binds to the amide groups of three residues in the selectivity filter.
• C) The K⁺ binds to the carbonyl groups of the backbone of a conserved pentapeptide sequence.
• D) An ATP molecule must be bound for the selectivity filter to operate.
• E) None of the answers is correct.

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