Question

amino acids are held together by

enzymes.

amino acid connectors.

peptide bonds.

histidine.

Explanation:

Amino acids are the building blocks of proteins. When amino acids combine, they form a chain through a specific type of chemical bond. Enzymes are biological catalysts that speed up chemical reactions but do not hold amino acids together. "Amino acid connectors" is not a scientifically recognized term for what binds amino acids. Histidine is an amino acid itself, not what links amino acids. Peptide bonds are the covalent bonds that form between the carboxyl group of one amino acid and the amino group of another amino acid, joining them together in a protein chain.

Answer:

peptide bonds.