Role of Cholesterol in Membranes

Medium Biochemistry Lipids And Membranes

In biological membranes, lipids play a crucial role in maintaining structural integrity and functionality. The fluid mosaic model describes the arrangement of various molecules within the membrane, emphasizing the roles of phospholipids, cholesterol, and proteins. Different types of lipids contribute distinct properties to the membrane, influencing its fluidity, permeability, and the ability to form lipid rafts. Phosphatidylcholine, a common phospholipid, is abundant in the lipid bilayer. Understanding the interactions and functions of these components is essential for grasping fundamental biochemical processes.

Which of the following statements correctly describes the role of cholesterol in biological membranes?

Cholesterol primarily serves as a structural component that forms lipid bilayers.

Cholesterol facilitates the passive movement of small molecules across the membrane.

Cholesterol enhances membrane fluidity and stability by preventing fatty acid tails from packing too closely.

Cholesterol acts as a signaling molecule that initiates transmembrane protein activation.

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