Proteins are composed of monomers called which, which form polypeptides and proteins?

• A. Nucleotides
• B. Amino acids
• C. Simple sugars
• D. Fatty acids

Answer: (B)

Proteins are built from amino acids, the monomers that join together to form polypeptide chains which then fold into functional proteins. Each amino acid links to the next via peptide bonds in a dehydration synthesis process, and the sequence and properties of these amino acids dictate the protein’s shape and function. The other options correspond to monomers of different biomolecules: nucleotides for nucleic acids, simple sugars for carbohydrates, and fatty acids for lipids.