AP BIOLOGY

Detailed explanation-1: -Cell membranes are composed primarily of fatty-acid-based lipids and proteins. Membrane lipids are principally of two types, phospholipids and sterols (generally cholesterol).

Detailed explanation-2: -Like all other cellular membranes, the plasma membrane consists of both lipids and proteins. The fundamental structure of the membrane is the phospholipid bilayer, which forms a stable barrier between two aqueous compartments.

Detailed explanation-3: -A cell’s membrane is primarily made up of a double layer of phospholipids (fatlike, phosphorus-containing substances). Each layer is composed of phospholipid molecules that contain a hydrophilic (water-loving) head and a hydrophobic (water-repellent) tail.

Detailed explanation-4: -Proteins and lipids make up the majority of the cell membrane.

Detailed explanation-5: -The cell membrane is made mostly of lipids, a group of macromolecules made of hydrocarbon chains, such as fats, sterols, and waxes. Lipids function to form membranes inside cells and to store energy. The most common lipid in the cell membrane are phospholipids.