AIPMT PRELIMS 2005 Botany Cell Membrane Structure MCQ Question
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?
Proteins in cell membranes can travel within the lipid bilayer
Proteins can remain confined within certain domains of the membrane
Proteins can also undergo flip-flop movements in the lipid bilayer
Many proteins remain completely embedded within the lipid bilayer
Correct Answer
Detailed Explanation
Proteins do not typically undergo flip-flop movements as this would require them to traverse the hydrophobic core of the lipid bilayer, which is energetically unfavorable.
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