Question

According to the fluid mosaic model of plasma membrane the quasi-fluid nature of
A) Protein enables lateral movement of lipids within the overall bilayer
B) Lipid and protein enables the lateral movement of carbohydrates
C) Lipid enables lateral movement of protein within the overall bilayer
D) Lipid enables flip-flop movements of proteins

Answer 1

Plasma membrane is present around the animal cell or plant cell. It is a semi-permeable membrane which allows certain ions or molecules in or out of the cell.

Complete answer:

Option A: Protein enables lateral movement of lipids within the overall bilayer. Plasma membrane is bi-lipid protein layer. Therefore, this is the incorrect option.
Option B: Lipid and protein enables the lateral movement of carbohydrates. Plasma membrane as a fluid combination of phospholipids, cholesterol, and proteins. Therefore, this is the incorrect option.
Option C: According to the fluid mosaic model proposed by Singer and Nicolson (1972), the quasi-fluid nature of lipids enables the lateral movement of proteins within the overall bilayer. This ability to move within the membrane layer is measured as Fluidity. Therefore, this is the correct option.
Option D: Lipid enables flip-flop movements of proteins. A lipid enables lateral movement of proteins within the overall bilayer.. Therefore, this is the incorrect option.

Thus, the correct option is (C) Lipid enables lateral movement of protein within the overall bilayer.

Note: Plasma membrane is responsible for

Endocytosis: It is a cellular process in which substances are brought into the cell.
Exocytosis: It is a form of active transport in which cells transport molecules like protein out of the cell.