Lecithin, a small molecular weight organic compound found in living tissues, is an example of: (1) A

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Question

Lecithin, a small molecular weight organic compound found in living tissues, is an example of: (1) Amino acids (2) Phospholipids (3) Glycerides (4) Carbohydrates

Accepted Answer

Correct Answer: B — PhospholipidsStep-by-step Solution:Lecithin is a common name for phosphatidylcholine, which is a type of phospholipid. Phospholipids are amphipathic molecules consisting of a glycerol backbone, two fatty acid chains (hydrophobic tails), and a phosphate group attached to a polar head group (such as choline). Lecithin is a major component of cell membranes and is found in egg yolk, soybeans, and animal tissues. It is not an amino acid (which are building blocks of proteins), nor a simple glyceride (which lacks the phosphate group), nor a carbohydrate. Therefore, lecithin is a phospholipid.Key Concepts: Biomolecules: classification of lipids – phospholipids, structure of lecithin (phosphatidylcholine), role in cell membranes.

Lecithin, a small molecular weight organic compound found in living tissues, is an example of: (1) Amino acids (2) Phospholipids (3) Glycerides (4) Carbohydrates

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Lecithin, a small molecular weight organic compound found in living tissues, is an example of: (1) Amino acids (2) Phospholipids (3) Glycerides (4) Carbohydrates

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