______ are the components of a cell membrane.

The correct answer is: Protein and lipid

• The main constituents of a cell membrane are lipids, proteins, and carbohydrates attached to proteins and lipids.
• Lipids are fatty molecules that constitute about 50% of the mass of most animal cell membranes, nearly all of the remainder being protein.
• There are approximately 5 × 106 lipid molecules in a 1 μm × 1 μm area of the lipid bilayer, or about 109lipid molecules in the plasma membrane of a small animal cell.