Biological unit
Encyclopedia
A biological unit consists of the smallest number of protein
Protein
Proteins are biochemical compounds consisting of one or more polypeptides typically folded into a globular or fibrous form, facilitating a biological function. A polypeptide is a single linear polymer chain of amino acids bonded together by peptide bonds between the carboxyl and amino groups of...

molecules which form a biologically active (e. g. catalytically active) unit.
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