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Which one of the following structural formulae of two organic compounds is correctly identified along with its related function?

1. A: Adenine — a nucleotide that makes up nucleic acids
2. B: Triglyceride — major source of energy
3. C: Uracil — a component of DNA
4. D: Lecithin — a component of cell membrane

Correct answer: D: Lecithin — a component of cell membrane

Solution

Lecithin is a phospholipid, and phospholipids are key structural components of cell membranes. The other options mismatch the compound with its function: adenine is a nitrogenous base, triglycerides are mainly energy storage molecules, and uracil is found in RNA, not DNA.

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