Every enzyme in IUB system of classification has been given a code number which consists of

Options

A. 6 digits
B. 8 digits
C. 4 digits
D. 2 digits

Answer

To answer the question regarding the IUB system of classification and the code number assigned to each enzyme, we can break down the information as follows:

### Step-by-Step Solution:

1. **Understanding the IUB System**: The IUB system stands for the International Union of Biochemistry and Molecular Biology. This organization has developed a systematic way to classify enzymes.

2. **Enzyme Commission Number**: Each enzyme is assigned a specific number known as the Enzyme Commission (EC) number. This number is crucial for identifying enzymes based on their functions.

3. **Structure of the EC Number**: The EC number consists of **four digits**. Each digit has a specific meaning:
- **First Digit**: Represents the general type of reaction catalyzed by the enzyme. There are six classes of enzymes, so this digit ranges from 1 to 6.
- **Second Digit**: Indicates the subclass of the enzyme, providing more specific information about the type of reaction.
- **Third Digit**: Represents the sub-subclass, further detailing the enzyme's function.
- **Fourth Digit**: This is the serial number of the enzyme within its subclass, allowing for unique identification.

4. **Conclusion**: Based on the structure of the EC number, we can conclude that every enzyme in the IUB system of classification has been given a code number that consists of **four digits**.

### Final Answer:
Every enzyme in the IUB system of classification has been given a code number which consists of **four digits**.

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