Protists have both a cell membrane and sometimes a cell wall.

Here's a breakdown:

* Cell membrane: All protists have a cell membrane, which is a thin, flexible layer that surrounds the cell and controls what enters and leaves.

* Cell wall: Some protists have a rigid cell wall outside the cell membrane for structural support and protection. The composition of the cell wall varies depending on the type of protist. For example, some protists have cell walls made of cellulose (like plants), while others have cell walls made of silica (like diatoms).

So, while all protists have a cell membrane, the presence of a cell wall depends on the specific protist species.