Which of the following is a recognized class of enzymes according to the Enzyme Commission (EC) classification?

• A. Proteoglycanases
• B. Phospholipases
• C. Nucleotidases
• D. Oxidoreductases

Answer: (D)

Verified step by step guidance

1. Understand the Enzyme Commission (EC) classification system, which categorizes enzymes into six major classes based on the type of reaction they catalyze.
2. Review the six recognized classes of enzymes: Oxidoreductases, Transferases, Hydrolases, Lyases, Isomerases, and Ligases.
3. Oxidoreductases are enzymes that catalyze oxidation-reduction reactions, where electrons are transferred between molecules. This is a recognized class in the EC system.
4. Proteoglycanases, Phospholipases, and Nucleotidases are not part of the six major EC classes. These terms describe specific enzyme activities but do not represent EC-recognized classes.
5. Conclude that Oxidoreductases is the correct answer because it is one of the six major classes defined by the EC classification system.