Answer:
Phospholipids and proteins
Explanation:
The cell membrane is primarily composed of a phospholipid bilayer. The phospholipid molecules are made of a hydrophilic phosphate head and a hydrophobic fatty acid tail. These form a bilayer arrangement and act as a semi-permeable membrane.
There are also many proteins embedded in the phospholipid bilayer. These proteins act as channels, shuttles, transporters, enzymes, and signalling molecules to control the access of materials that cannot cross the bilayer and to respond to the extracellular environment.
