NEET BIOLOGY

Detailed explanation-1: -The principal components of the plasma membrane are lipids (phospholipids and cholesterol), proteins, and carbohydrate groups that are attached to some of the lipids and proteins. A phospholipid is a lipid made of glycerol, two fatty acid tails, and a phosphate-linked head group.

Detailed explanation-2: -Most plasma membranes consist of approximately 50% lipid and 50% protein by weight, with the carbohydrate portions of glycolipids and glycoproteins constituting 5 to 10% of the membrane mass.

Detailed explanation-3: -Both prokaryotic and eukaryotic cells have a plasma membrane, a double layer of lipids that separates the cell interior from the outside environment.

Detailed explanation-4: -The cell membrane consists of three classes of amphipathic lipids: phospholipids, glycolipids, and sterols. The amount of each depends upon the type of cell, but in the majority of cases phospholipids are the most abundant, often contributing for over 50% of all lipids in plasma membranes.

Detailed explanation-5: -Plasma membrane or cell membrane is the outer covering of all cells but it is present below the cell wall in animal cells. It is mainly composed of phospholipid bilayer structure with embedded proteins and some carbohydrates. Thus, the correct answer is option D.