Final answer:
A peptide bond joins amino acids together in a chain, forming a dipeptide or larger peptide. The amino group of one amino acid reacts with the carboxyl group of another, creating the bond.
Step-by-step explanation:
A peptide bond joins amino acids together in a chain. The bond is formed between the amino group of one amino acid and the carboxyl group of another amino acid. This bond is also known as an amide bond or peptide linkage.
For example, in a dipeptide made of alanine and glycine, a peptide bond is formed between the amino group of alanine and the carboxyl group of glycine.
The sequence of amino acids in a peptide or protein is written with the amino acid whose amino group is free (the N-terminal end) on the left and the amino acid with a free carboxyl group (the C-terminal end) on the right.