International Enzyme Classification (EC Numbers): Which class is EC 2?

Difficulty: Easy

Correct Answer: Transferases

Explanation:


Introduction:
The Enzyme Commission (EC) numbering system classifies enzymes into major classes based on the reactions they catalyze. Knowing the mapping helps interpret literature and databases.


Given Data / Assumptions:

  • Standard EC classes: 1–6 (and extensions).
  • Question asks specifically for class EC 2.


Concept / Approach:

EC classes: 1 Oxidoreductases, 2 Transferases, 3 Hydrolases, 4 Lyases, 5 Isomerases, 6 Ligases. Transferases move a functional group (e.g., methyl, glycosyl, phosphoryl) from a donor to an acceptor, central in metabolism and regulation.


Step-by-Step Solution:

1) Recall class mapping list.2) Identify EC 2 in the mapping.3) Conclude EC 2 corresponds to Transferases.


Verification / Alternative check:

Cross-checking with enzyme databases (e.g., BRENDA/ExplorEnz) confirms EC 2 = Transferases.


Why Other Options Are Wrong:

A: EC 3, not 2. B: EC 6. D: EC 5. E: EC 1.


Common Pitfalls:

Mixing up EC 1 and EC 2 due to both being common in pathways; remember 1 = redox (oxidation–reduction), 2 = group transfer.


Final Answer:

Transferases

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