Which statement is true about a cell wall but not a cell membrane?
it forms the outer layer of a cell.
it gives an animal cell its shape.
it is selectively permeable.
it is made mostly of cellulose.

The right answer is that whilst the cell wall is made mostly of cellulose, the cell membrane is not. Instead, a cell membrane is composed of lipids and proteins. The other possible answers for this question are all incorrect: In a plant call the cell wall forms the outer layer, whilst in an animal cell a cell membrane does. Cell walls are not found in animal cells. Cell walls are not permeable.