AP BIOLOGY

Detailed explanation-1: -So, the correct option is ‘False’.

Detailed explanation-2: -The cell membrane is not a solid structure. It is made of millions of smaller molecules that create a flexible and porous container. Proteins and phospholipids make up most of the membrane structure.

Detailed explanation-3: -The plasma membrane is not a stiff, solid structure. It is quite fluid and both phospholipid molecules and embedded proteins are able to move side-to-side in the membrane. The fluidity of the plasma membrane is necessary for the activities of certain enzymes and transport molecules within the membrane.

Detailed explanation-4: -Under physiological conditions phospholipid molecules in the cell membrane are in the liquid crystalline state. It means the lipid molecules are free to diffuse and exhibit rapid lateral diffusion along the layer in which they are present.

Detailed explanation-5: -The cell membrane-sometimes idealized as a fluid membrane-is very soft and deformable1.