Question

1. which of the following is a lipid (?) accompanied by chemical structure diagrams labeled a, b, c, d and multiple - choice options below the diagrams

Explanation:

To determine which is a lipid, we analyze each option:

• Option A: Structure has an amino group ($-NH_2$) and carboxyl group ($-COOH$), characteristic of an amino acid (not a lipid).
• Option B: Structure with multiple hydroxyl ($-OH$) groups and a carbonyl, typical of a carbohydrate (e.g., a sugar like glucose, not a lipid).
• Option C: Likely a nucleotide (has a sugar, phosphate, and nitrogenous base), part of nucleic acids (not a lipid).
• Option D: Structure with long hydrocarbon chains and hydroxyl groups, consistent with a lipid (e.g., a fatty acid - derived lipid or phospholipid - like structure).

Answer:

D