The newly discovered membrane channel protein that accounts for why water can cross a membrane more quickly than expected is:

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Aquaporin is known to be a membrane channel protein that facilitates the movement of water molecules across membranes. This explains why water can cross a membrane more quickly than expected. ATP synthetase is an enzyme that catalyzes the synthesis of ATP from ADP and inorganic phosphate, and the sodium-potassium pump is a transmembrane protein that regulates the concentration of sodium and potassium ions inside and outside a cell. Integrin is a transmembrane protein that acts as a receptor for extracellular matrix proteins.

The Newly Discovered Membrane Channel Protein That Accounts for Why