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

To determine which option is a common example of a phospholipid present in cell membranes, let's analyze each given option:

1. Lecithin: Lecithin is a well-known phospholipid found in cell membranes. It plays a crucial role in forming the phospholipid bilayer, which is essential for maintaining cell structure and function. Lecithin is composed of phosphatidylcholine, a significant component of biological membranes.
2. Cholesterol: Although cholesterol is a key component of cell membranes, providing fluidity and stability, it is not a phospholipid. Hence, this option does not fit the required criteria.
3. Palmitic acid: Palmitic acid is a fatty acid, not a phospholipid. Fatty acids can be components of phospholipids but on their own do not qualify as phospholipids.
4. Glucose: Glucose is a simple sugar (monosaccharide) and not related to phospholipids or cell membrane structure.

Therefore, based on the above analysis, the correct answer is Lecithin. Its presence as a phospholipid in cell membranes is essential for the dynamic nature of the membrane, aiding in various cellular functions such as signaling and providing structural integrity.