Which analogy best completes the statement: amino acid is to protein as ______ is to polysaccharide?

• A. Nucleotide
• B. Monosaccharide
• C. Glycerol
• D. Fatty acid

Answer: (B)

Verified step by step guidance

1. Understand the relationship in the analogy: an amino acid is the basic building block (monomer) of a protein, which is a polymer.
2. Identify the polymer in the second part of the analogy: polysaccharide is a polymer made up of smaller units.
3. Recall that polysaccharides are composed of monosaccharides, which are their monomeric building blocks.
4. Compare the options given: nucleotide, monosaccharide, glycerol, and fatty acid, and determine which one is the monomer of a polysaccharide.
5. Conclude that since monosaccharides are the monomers that make up polysaccharides, the correct analogy is: amino acid is to protein as monosaccharide is to polysaccharide.