Amino acids are essentially the building blocks of proteins and peptides, which consist of chains of amino acid residues. These residues are amino acid molecules that are capable of undergoing a fusion process with other molecules to make a single, large molecule. The difference between a protein and a peptide is a matter of size and variety. Proteins are large molecules and can contain over 50 types of amino acids. Peptides receive their name from the peptide bonds that hold the amino acids together in the chains. Pepsin can sever these bonds and break proteins down into peptides. Because of this ability, this enzyme is considered a protease.
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