Which of the following is true for the mechanism of the 2Na+/glucose symporter?
A) Binding of 2 Na+ to the symporter open to the outside of the cell allows a glucose molecule outside the cell to bind.
B) Binding of Na+ and glucose causes the symporter to open to the inside of the cell.
C) Release of 2 Na+ ions to the inside of the cells causes release of the glucose molecule.
D) Binding of 2 Na+ to the symporter on the inside of the cell causes the symporter to open to the outside of the cell and release of the Na+ ions.
E) All of the above are steps in the mechanism.
Answer: D
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