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Questions and Answers
Catalase is a ______ enzyme.
Catalase is a ______ enzyme.
heme
This enzyme brings about the disproportionation of ______ peroxide.
This enzyme brings about the disproportionation of ______ peroxide.
hydrogen
The chemical reaction releases ______ gas.
The chemical reaction releases ______ gas.
oxygen
The enzyme contains ______ or related compounds as a prosthetic group.
The enzyme contains ______ or related compounds as a prosthetic group.
These enzymes catalyze the decomposition of peroxides especially ______ peroxide to oxygen and water.
These enzymes catalyze the decomposition of peroxides especially ______ peroxide to oxygen and water.
Flashcards
Catalase
Catalase
An enzyme that breaks down hydrogen peroxide (H₂O₂) into water (H₂O) and oxygen (O₂).
Disproportionation Reaction
Disproportionation Reaction
A chemical reaction where a single substance acts as both the oxidizer and the reducer, resulting in the formation of two different products.
Prosthetic Group
Prosthetic Group
A non-protein molecule that helps an enzyme function.
Peroxide
Peroxide
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Enzyme Specificity
Enzyme Specificity
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Study Notes
Metal Activated Enzymes: Iron Enzymes
- Iron is an essential element in redox reactions in plant metabolism.
- Catalases are heme enzymes.
- Catalases catalyze the disproportionation of hydrogen peroxide.
- Harmful H₂O₂ is decomposed into O₂ and H₂O.
- The reaction is: 2H₂O₂ → O₂ + 2H₂O.
Catalase Mechanism
- Catalase is an enzyme with a systematic name "donor hydrogen peroxide oxidoreductase".
- It catalyzes the chemical reaction: (1) to release oxygen.
- It's a strong catalyst using hydrogen peroxide as the donor.
- It uses a prosthetic group, containing haematin or related compounds.
- These enzymes catalyze the decomposition of peroxidases like hydrogen peroxide, breaking it down into oxygen and water.
- This process avoids buildup of toxic peroxides.
Catalase as a Donor
- Catalase has a donor role, receiving or accepting electrons.
- The enzyme acts as an oxidising agent in some cases.
Chemical Reaction
- The chemical reaction H₂O₂ is converted to products O₂ and H₂O.
- Peroxide is the donor and is used as an oxidising agent by the enzyme.
- The chemical reaction releases oxygen.
- This chemical equation is 2H₂O₂ → O₂ + 2H₂O.
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