Question

Arrange the different classes of enzymes according to class number (1-5). A. Isomerases B. Hydrolases C. Transferases D. Oxidoreductases E. Lyases Choose the correct answer from the options given below :

• A. D, B, C, A, E
• B. D, C, B, E, A
• C. D, A, B, C, E
• D. A, C, D, B, E

Hint:

Use the mnemonic phrase: "Over The Hill Lyases Isomerize Ligases" (Oxidoreductase, Transferase, Hydrolase, Lyase, Isomerase, Ligase) to remember the sequence 1 to 6 easily.

Answer 1

The Correct Option is B

Step 1: Concept
The International Union of Biochemistry and Molecular Biology (IUBMB) established a systematic standard classification system for enzymes based on the specific type of chemical reaction they catalyze.

Step 2: Meaning
Every enzyme is assigned an Enzyme Commission (EC) number, where the first digit represents the major primary class of the enzyme spanning from numbers 1 to 6.

Step 3: Analysis
The standardized chronological order of the first five official enzyme classes is given as follows: Class 1: Oxidoreductases (D) Class 2: Transferases (C) Class 3: Hydrolases (B) Class 4: Lyases (E) Class 5: Isomerases (A) Arrangling them from class 1 to 5 gives the sequence D, C, B, E, A.

Step 4: Conclusion
This sequence aligns perfectly with option (2) from the image, which corresponds to structural option (B). Final Answer: (B)