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(B) The fluid mosaic model describes the cell membrane as a quasi-fluid structure where lipids and proteins can move laterally. $A$, $C$, and $D$ are

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

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(B) The fluid mosaic model describes the cell membrane as a quasi-fluid structure where lipids and proteins can move laterally. $A$, $C$, and $D$ are consistent with the fluid nature and the structural organization of the membrane. However, $B$ is incorrect because proteins do not undergo flip-flop movements (transverse diffusion) across the lipid bilayer due to their large size and polar nature, which makes it energetically unfavorable to pass through the hydrophobic core of the membrane.

According to the 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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