Question

which of the following pairs are not related?
a fat - lipid
b sugar - carbohydrate
c nucleic acid - starch
d amino acid - protein

Explanation:

• Option A: Fat is a type of lipid. So, "Fat - lipid" is a related pair.
• Option B: Sugar is a simple form of carbohydrate. So, "Sugar - carbohydrate" is a related pair.
• Option C: Nucleic acid (like DNA and RNA) and starch (a carbohydrate) have no direct relationship. Nucleic acids carry genetic information, while starch is an energy - storage molecule in plants.
• Option D: Proteins are made up of amino acids. So, "Amino acid - protein" is a related pair.

Answer:

C. Nucleic acid - starch