Protein: Proteins are large molecules composed of one or more long chains of amino acids, essential for the structure, function, and regulation of the body's cells, tissues, and organs.
Peptide Bond: A peptide bond is a chemical bond formed between two molecules when the carboxyl group of one molecule reacts with the amino group of another molecule, releasing a molecule of water (H2O).
Enzyme: Enzymes are biocatalysts that speed up biochemical reactions in living organisms; they are typically proteins composed of one or more polypeptide chains folded into a complex three-dimensional shape