Prosthetic Group Definition:
A nonprotein unit attached to a protein, such as heme in hemoglobin.
Prosthetic Group Explained:
A tightly bind, particular non-polypeptide unit required for the biological function of some protein. The prosthetic group may be organic (such as a vitamin, saccharide, or lipid) or inorganic (such as an alloy ion), but is not composed of amino acids.