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Q.
Co-factor (prosthetic group) is a part of holoenzyme. It is
Biomolecules
Solution:
Enzymes are simple if they are made of only proteins ( $e . g$., pepsin, amylase etc.) while conjugated enzymes have an additional non-protein cofactor which may be organic or inorganic. Loosely attached organic cofactor is coenzyme (e.g., $NAD^{+ } , FAD$) while firmly attached one is prosthetic group (e.g., heme, biotin). The intact enzyme-cofactor complex is called holoenzyme. When the cofactor is removed, the remaining protein which is inactive is called apoenzyme.