One statement that would be true of a membrane-bound protein that works in conjunction with a sodium-potassium pump during secondary active transport would be that it will only activate when both a specific small molecule and ion bond to it.
Therefore, given that the statement in the question describes membrane-bound carrier proteins that work in conjunction with ionic pumps, we can confirm that this is done as a form of concentration regulation, to ensure that one does not activate without the other, therefore, they will need a specific ion and molecule to bond in order to activate.
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