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Which one of the following biomolecules is correctly characterized?

1. Lecithin - A phosphorylated glyceride found in cell membrane.
2. Palmitic acid - An unsaturated fatty acid with 18 carbon atoms.
3. Adenylic acid - Adenosine with a glucose phosphate molecule.
4. Alanine amino acid - Contains an amino group and an acidic group anywhere in the molecule.

Correct answer: Lecithin - A phosphorylated glyceride found in cell membrane.

Solution

Lecithin is a phospholipid (a phosphorylated glyceride) and is a major component of cell membranes. The other choices contain clear errors in structure or naming: palmitic acid is saturated, adenylic acid contains ribose not glucose, and alanine’s amino and carboxyl groups are on the same carbon framework.

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