Enzyme Classification

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Questions and Answers

Which class of enzymes catalyzes cleavage of C-C, C-S, and certain C-N bonds?

  • Oxidoreductases
  • Hydrolases
  • Lyases (correct)
  • Transferases

Which class of enzymes catalyzes racemization of optical or geometric isomers?

  • Isomerases (correct)
  • Oxidoreductases
  • Transferases
  • Ligases

Which class of enzymes catalyzes formation of bonds between carbon and N coupled to hydrolysis of high-energy phosphates?

  • Hydrolases
  • Transferases
  • Oxidoreductases
  • Ligases (correct)

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Study Notes

  1. Enzymes are classified into six major classes in the systematic naming system.
  2. The suffix -ase is attached to a description of the catalyzed chemical reaction.
  3. Oxidoreductases catalyze oxidation-reduction reactions.
  4. Transferases catalyze transfer of C-, N-, or P-containing groups.
  5. Hydrolases catalyze cleavage of bonds by addition of water.
  6. Lyases catalyze cleavage of C-C, C-S, and certain C-N bonds.
  7. Isomerases catalyze racemization of optical or geometric isomers.
  8. Ligases catalyze formation of bonds between carbon and N coupled to hydrolysis of high-energy phosphates.
  9. University of Baghdad's College of Medicine is teaching this in 2022-2023.
  10. Examples of reactions for each class are provided.

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