Question

what biological membrane is made up of a phospholipid bilayer? cell membrane liver membrane nuclear membrane

Explanation:

The cell membrane is primarily composed of a phospholipid bilayer, which forms a barrier and regulates the movement of substances in and out of the cell. Liver membrane is not a standard biological - membrane term in this context. The nuclear membrane also has a membrane structure but is more complex with nuclear pores etc. compared to the basic structure of the cell membrane's phospholipid bilayer.

Answer:

cell membrane