Transport and Channel Proteins

Correct Answer: B. Transport proteins are often used by many substrates while channel proteins are generally used by ions.

Both of these types of proteins have a large variety in their shapes, sizes, and complexities. Therefore, no generalization can be made about them, and [C], [D], and [E] can be eliminated. Many transport proteins can use passive transport as well via uniport, for example, so [A] can be eliminated too. This leaves [B], where it states that channel proteins are used generally by ions. They aren’t called “ion channels” for nothing!

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