Besides controlling what goes in and out of the cell, what other two jobs does the cell membrane have?

It protects the cell by acting as a barrier.

receives chemical messengers from other cell.

Explanation:

Cell membrane act as a barrier which keep harmful substances to enter the cell and prevents substances to go out of the cell. It also receives chemical messengers and signals from other cell.  This cell membrane is responsible for controlling of the flow of substances in and out of the cell. It also helps the cell in cell mobility from one place to another.

the answer is b.) hydrogen bonds between bases.