Chapter 12 Flashcards
1
Q
What is the action of Oxidase?
A
- Oxidases catalyze the removal of hydrogen from a substrate using oxygen as a hydrogen acceptor
- They form water or hydrogen peroxide as a reaction product
2
Q
What is the action of a dehydrogenase class of enzyme?
A
- Transfer of hydrogen from one substrate to another in a coupled oxidation-reduction reaction.
- Transfer of electrons in the respiratory chain of electron transport from substrate to oxygen.
3
Q
What are the coenzymes that the dehydrogenase class of enzymes depend on?
A
Nicotinamide Coenzymes
- NAD+
- NADP+
4
Q
2 Types of Enzymes that Fall Under the Hydroperoxidase Category
A
- Peroxidases
- Catalase
5
Q
Peroxidases
A
Reduce peroxides using various electron acceptors
- H2O2 + AH2 –Peroxidase–> 2 H2O + A
6
Q
Catalase
A
Uses hydrogen peroxide as electron donor & electron acceptor
- 2H2O2 –Catalase–> 2 H2O + O2
7
Q
Oxygenases
A
Catalyze the direct transfer & incorporation of oxygen into a substrate molecule
8
Q
2 Types of Oxygenases
A
- Dioxygenases
- Monooxygenases
9
Q
Superoxide Dismutase
A
Protects aerobic organisms against oxygen toxicity
