Biology for IGCSE & O level - Movement Into And Out Of Cells (Section 3 - No. 17)
How does the presence of transport proteins affect the movement of molecules across a cell membrane?
They make the membrane less permeable.
They allow only certain molecules to cross the membrane.
They allow all molecules to cross the membrane more quickly.
They have no effect on the movement of molecules.
Explanation
Transport proteins selectively aid in movement.
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