According to widely accepted “fluid mosaic model” cell membranes are semi-fluid, where lipids and integral proteins can diffuse randomly. In recent years, this model has been modified in several respects. In this regard, which of the following statements is incorrect?

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Proteins in cell membranes can travel within the lipid bilayer.

Proteins can also undergo flip-flop movements in the lipid bilayer.

Proteins can remain confined within certain domains of the membrane.

Many proteins remain completely embedded within the lipid bilayer.

answer is B.

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Detailed Solution

The quasi-fluid nature of lipid enable lateral movement of proteins within the overall bilayer. This ability to move within the membrane is measured as its fluidity.

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