Which statement would be true of a membrane-bound protein that works in conjunction with a sodium–potassium pump during secondary active transport?
a. it will be able to transport an ion in both directions across the cell membrane and a small molecule in one direction.
b. it will block a small molecule from moving across the cell membrane in response to an increase in concentration of an ion in the external environment.
c. it will move a small molecule across the cell membrane in response to a build-up in concentration of the molecule in the external environment.
d. its conformation will change when both an ion and a small molecule bind to it.
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