Which best describes the structure of a cell membrane? a. proteins between two bilayers of phospholipids b. proteins embedded in a bilayer of phospholipids c. a bilayer of protein coating a layer of phospholipids d. cholesterol embedded in a bilayer of phospholipids

Verified step by step guidance

1. Understand that the cell membrane is primarily composed of a phospholipid bilayer, which forms a barrier that is selectively permeable to ions and organic molecules.
2. Recognize that proteins play a crucial role in the cell membrane by facilitating various functions such as transport, signal transduction, and acting as enzymes.
3. Identify that these proteins are not simply layered between the phospholipid bilayers but are integrated within the bilayer itself.
4. Consider the role of cholesterol in the cell membrane, which is to modulate the fluidity and stability of the membrane, but it is not the primary structural component.
5. Conclude that the correct description of a cell membrane structure involves proteins that are embedded within the phospholipid bilayer, rather than being sandwiched between two separate bilayers or forming a coating around the phospholipids.