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:
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:
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
Discussion & Comments