Question

Which of the following is a common example of phospholipid present in cell membranes?

• A. Lecithin
• B. Cholesterol
• C. Palmitic acid
• D. Glucose

Hint:

Lecithin, or phosphatidylcholine, is a common phospholipid found in cell membranes.

Answer 1

The Correct Option is A

Concept:
Phospholipids are important structural components of cell membranes.

Step 1: Structure of phospholipids.
Phospholipids contain fatty acids, glycerol, phosphate group, and an additional alcohol-containing group.

Step 2: Lecithin.
Lecithin is also called phosphatidylcholine. It is a common phospholipid present in biological membranes.

Step 3: Role in cell membrane.
Phospholipids form the lipid bilayer of the cell membrane. Their hydrophilic head faces water, and hydrophobic tails face inward.

Step 4: Checking other options.
Cholesterol is a sterol.
Palmitic acid is a fatty acid.
Glucose is a carbohydrate.
Lecithin is a phospholipid. \[ \boxed{\text{Lecithin}} \]