Proteins Formed from Amino Acids

Steps:

• Recall that amino acids are the building blocks of biological macromolecules.
• Identify which choice matches a macromolecule constructed by linking amino acids via peptide bonds.
• Eliminate options that are carbohydrates or waste products, not involving amino acids.
• Confirm the match with protein as the direct polymer of amino acids.

Why C is correct:

• Proteins are polypeptides formed by the polymerization of amino acids, as defined in biochemistry where 20 standard amino acids link to create diverse protein structures.

Why the others are wrong:

• A. Glucose is a monosaccharide, the basic unit of carbohydrates, not derived from amino acids.
• B. Glycogen is a polysaccharide made from glucose molecules for energy storage.
• D. Urea is a nitrogenous waste product from amino acid breakdown, not built from them.

Final answer: C