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Lecithin is a fat-like substance (a phospholipid), which is a part of plasma membrane.

1. Lecithin is a carbohydrate.
2. Lecithin is a protein.
3. Lecithin is a phospholipid.
4. Lecithin is a nucleic acid.

Correct answer: Lecithin is a phospholipid.

Solution

Lecithin is a phospholipid, a type of lipid found in plasma membranes. Its structure fits the membrane role described, unlike carbohydrates, proteins, or nucleic acids.

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