The molecules across the membrane are transported through active or passive transport. The molecules can pass through protein channels only in the Carrier-Mediated Transport. Thus, option D is correct.
Carrier-Mediated Transport is the active transport that requires energy or other co-transporters to move the molecules across the semi-permeable membrane. The Carrier-Mediated uses the energy-dependent pathway and receptors to transport the molecules.
Carrier-Mediated Transport uses the properties of competition, specificity, and saturation to transport the molecules. The molecule can pass only if they have a specific shape to that of the receptor channel.
Therefore, option D. molecules can pass through protein channels only in the Carrier-Mediated Transport.
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