Question

please refer to the passage to help you answer the problem. what do the protein channels move from a region of higher concentration to a region of lower concentration? large molecules amino acids nucleic acids

Explanation:

To answer this, we recall concepts about protein channels (like in facilitated diffusion). Protein channels help move molecules down their concentration gradient (high to low). Large molecules can't pass through the lipid bilayer easily and use protein channels for facilitated diffusion. Amino acids are often transported via active transport or specific transporters, and nucleic acids are not typically moved by protein channels in this simple diffusion - like context. So the correct option is related to large molecules.

Answer:

A. large molecules