Aquaporin Has a Pair of Key Asparagine Residues Located on the Wall

question 24

Multiple Choice

Aquaporin has a pair of key asparagine residues located on the wall almost halfway through its pore. These residues simultaneously bind to the oxygen atom of a passing water molecule, rendering it unavailable for hydrogen-bonding. As a result, …

• A) the channel can conduct negatively charged (but not positively charged) ions.
• B) the channel can conduct glycerol as well as water.
• C) the channel cannot conduct glycerol.
• D) the channel cannot conduct protons.
• E) the channel cannot conduct chloride ions.

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