I: | is the prosthetic group in peroxidase and catalase |
II: | is not a part of the active site of the peroxidase and catalase |
1. | Acting as a temporary storage of electrons and protons. |
2. | Serving as structural components of cell membranes. |
3. | Directly participating as one of the substrates in a reaction. |
4. | Acting as integral membrane proteins. |
Prosthetic groups differ from co-enzymes in that
1. they require metal ions for their activity.
2. they (prosthetic groups) are tightly bound to apoenzymes.
3. their association with apoenzymes is transient.
4. they can serve as co-factors in a number of enzyme-catalyzed reactions.