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Questions and Answers
What type of enzyme acts as a hydrogen donor during the oxidation of a substrate?
What type of enzyme acts as a hydrogen donor during the oxidation of a substrate?
- Ligase
- Transferase
- Lyase
- Oxidoreductase (correct)
Which enzyme type is responsible for the transfer of functional groups?
Which enzyme type is responsible for the transfer of functional groups?
- Hydrolase
- Lyase
- Transferase (correct)
- Isomerase
What reaction does a hydrolase facilitate?
What reaction does a hydrolase facilitate?
- Isomerization
- Hydrolysis (correct)
- Oxidation-reduction
- Synthetic reactions
Which enzyme type utilizes ATP to join two molecules?
Which enzyme type utilizes ATP to join two molecules?
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Which of the following enzyme types is involved in isomerization reactions?
Which of the following enzyme types is involved in isomerization reactions?
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Study Notes
Enzyme Types
- Enzymes are biological catalysts that accelerate chemical reactions
- Six major classes of enzymes: Oxidoreductases, Transferases, Hydrolases, Lyases, Isomerases, Ligases
- Oxidoreductases catalyze oxidation-reduction reactions
- Involve the transfer of hydrogen atoms
- Dehydrogenases or reductases act as hydrogen donors in oxidation reactions
- Oxidases accept oxygen atoms
- Alcohol dehydrogenase is an example of an oxidoreductase
- Transferases catalyze the transfer of functional groups
- Hexokinase is an example of a transferase
- Hydrolases catalyze hydrolysis reactions
- Break bonds by adding water
- Lipase is an example of a hydrolase
- Lyases specialize in the addition or removal of water, ammonia, or carbon dioxide
- Pyruvate decarboxylase is an example of a lyase
- Isomerases catalyze isomerization reactions
- Move functional groups within the same molecule
- Resulting molecule is an isomer of the original molecule
- Retinol isomerase is an example of an isomerase
- Ligases catalyze synthetic reactions (joining two molecules)
- Require ATP
- Succinate Thiokinase is an example of a ligase
- Not all enzymes are proteins. Some are RNA molecules.
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