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Biochemistry

Biochemistry Question of the Day

Practice Biochemistry with the production-style question-of-the-day selection for this public URL.

Question 1

Which of the following reaction types is not catalyzed by cobalamin enzymes?

  1. Ligation of bonds between DNA bases
  2. Intramolecular rearrangements
  3. Methylations
  4. Reduction of ribonucleotides
  5. All of these are reaction types catalyzed by cobalamins
Explanation: Cobalamin enzymes are B12-dependent enzymes. This type of enzyme catalyzes methylations, intramolecular rearrangements, and reduction of ribonucleotides. However, it is not associated with the ligation of the hydrogen bonds between DNA bases.