Question

protein channels are embedded in the cell membrane. what is their function? they provide an easy way for all molecules to leave the cell. they allow specific molecules in or out of the cell.

Explanation:

Cell membranes are selectively permeable. Protein channels (like the ones shown) are not for all molecules. They are specific. For example, ion - specific channels allow only certain ions. Carrier proteins also work in a specific manner. The first option says "for ALL molecules" which is incorrect. The second option about allowing specific molecules in or out aligns with the nature of protein channels (and carrier proteins) as part of the cell membrane's selective permeability mechanism.

Answer:

They allow specific molecules in or out of the cell.