Question

Assertion: The quasifluid nature of lipid enables lateral movement of proteins within the overall bilayer
Reason : This ability to move within the membrane is called fluidity and is important for cell growth

• A. If both assertion and reason are true and reason is the correct explanation of assertion
• B. If both assertion and reason are true but reason is not the correct explanation of assertion
• C. If assertion is true but reason is false
• D. If both assertion and reason are false

Answer 1

Answer: (B)

The structure of cell membrane was proposed by Singer and Nicolson $(1972)$ widely accepted as fluid mosaic model. According to this, the quasifluid nature of lipid enables lateral movement of proteins within the overall bilayer. This ability to move within the membrane is measured as its fluidity. The fluid nature of the membrane is important for functions like cell growth, formation of intercellular junctions, secretion, endocytosis, cell division etc