Functions of cell membranes in a bacterium cell

A bacterial membrane is made of a phospholipid bilayer and protein meaning it has the same function of a general cell membrane.
Acts as a permeable barrier for most molecules and transports specific molecules (e.g. nutrients, ions) into the cell. It also protects the cell from toxic substances entering.

It's either -limiting factors or -scarce resources but i'd go with my first answer since the food and water are abundant they really aren't scarce