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

Detailed explanation-5: -The fluid mosaic model concludes that the cell membrane is quasi fluid that means, protein icebergs in lipid sea as the membrane model comprises lipid molecules with globular proteins like integral and peripheral proteins and sterols. Therefore the correct answer is ‘B’. Quasi Fluid.