Question

Identify the statement that describes the function of cholesterol in the cell membrane.

a) It forms rigid structures within the membrane.
b) It interferes with the movements of the fatty acid tails of the phospholipids.
c) It enhances the fluidity of the membrane.
d) It acts as a signaling molecule within the cell.

Answer 1

Cholesterol in the cell membrane acts to enhance its fluidity and maintain functional membrane structure at varying temperatures, also organizing proteins into lipid rafts. The correct option is c.

Step-by-step explanation:

The function of cholesterol in the cell membrane is to enhance the fluidity of the membrane. Cholesterol interspersed between phospholipids maintains the appropriate level of membrane fluidity by acting as a buffer against temperature changes.

Higher temperatures might cause the membrane to become too fluid, while lower temperatures could make it too rigid. Therefore, cholesterol assists in maintaining fluidity at various temperatures, extending the range at which the membrane is functional. Furthermore, cholesterol plays a role in organizing proteins into lipid rafts, thereby contributing to the membrane's functional architecture. Hence, c is the correct option.