Concept:The cell membrane is a bilayer of
phospholipids with embedded
proteins and
cholesterol.
Explanation:The plasma membrane (cell membrane) encloses all cells.
It consists mainly of
phospholipids arranged in a bilayer.
The hydrophilic (water-loving) heads face outward, while the hydrophobic tails face inward.
Proteins are embedded as integral or peripheral components.
Cholesterol is tucked between the hydrophobic tails to regulate fluidity.
Option A correctly states: a bilayer of
phospholipid molecules in which
proteins and
cholesterol are embedded.
Option B is wrong because
proteins do not form the bilayer;
lipids do.
Option C is wrong because the lipids are
phospholipids, not neutral lipids.
Option D is wrong because
cholesterol and
proteins are indeed present in the membrane.
Answer:Option A