Question

the lipid layer that forms the foundation of cell membranes is primarily composed of molecules called

multiple choice

phospholipids

proteins

carbohydrates

cholesterol

Explanation:

Cell membranes have a lipid - bilayer structure mainly made of phospholipids. Phospholipids have a hydrophilic head and hydrophobic tails which arrange to form the membrane foundation. Proteins are embedded in or associated with the membrane but not the main foundation - forming molecules. Carbohydrates are often attached to proteins or lipids on the membrane surface. Cholesterol is present in the membrane to regulate fluidity but not the primary component of the lipid layer.

Answer:

A. phospholipids