Question

which set of membrane proteins in the figure depicts the transport of solute molecules across the membrane?

Explanation:

In cell - membrane transport, proteins can facilitate the movement of solute molecules across the membrane. In option A, the presence of ATP indicates active transport where solute molecules are moved against their concentration gradient with the help of membrane - bound proteins. Options B, C, and D do not clearly depict the transport of solute molecules as clearly as option A which shows a distinct movement of solute molecules across the membrane with energy input.

Answer:

A.