Carrier protein can mutliple choice question.

he correct answer is (D) Perform all of these functions.

Carrier proteins, also known as transport proteins or permeases, are membrane proteins that facilitate the movement of molecules across cell membranes. They can perform various functions, including:

– Transporting only one specific substance (A), such as glucose transporters
– Transporting multiple substances (B), such as amino acid transporters that can transport different amino acids
– Exchanging one substance for another (C), such as sodium-potassium pumps that exchange sodium ions for potassium ions