Question

multiple choice question
plasma membranes are organized by having ______.

three lipid layers
one lipid layer and a capsule
one lipid layer and a cell wall
two lipid layers

Explanation:

Plasma membranes follow the fluid mosaic model, which defines them as a phospholipid bilayer (two lipid layers) where hydrophobic tails face inward and hydrophilic heads face outward, forming the basic structural organization of the membrane. The other options are incorrect: plasma membranes do not have three lipid layers, and capsules/cell walls are separate structures not part of the plasma membrane's core organization.

Answer:

two lipid layers