Question

which monomer is incorrectly paired? a. protein: monopeptide b. carbohydrate: monosaccharide c. nucleic acid: nucleotide d. lipid: no monomer

Explanation:

• Option A: Proteins are polymers made of amino acids (monomers), not monopeptides. A monopeptide is a single amino acid, but the monomer of protein is amino acid, so this pairing is incorrect.
• Option B: Carbohydrates (polysaccharides) are made of monosaccharide monomers (e.g., glucose), so this pairing is correct.
• Option C: Nucleic acids (DNA, RNA) are made of nucleotide monomers, so this pairing is correct.
• Option D: Lipids do not have a single, universal monomer (they are a diverse group like fats, phospholipids, steroids), so stating "no monomer" is correct.

Answer:

A. protein: monopeptide