Some enzyme when secreated are inactive state. Such enzyme in inactive state are called.

Options

A. isonzymes
B. conezymes
C. zymogens
D. apenzyme

Answer

**Step-by-Step Solution:**

1. **Understanding Enzymes**: Enzymes are biological catalysts that speed up chemical reactions in the body. They are crucial for various metabolic processes.

2. **Inactive State of Enzymes**: Some enzymes are secreted in an inactive form to prevent them from acting on their substrates prematurely. This is important for protecting the tissues and organs that produce them.

3. **Terminology**: The question asks for the term used to describe enzymes in their inactive state. The options given are isozyme, coenzyme, zymogen, and epinezyme.

4. **Identifying the Correct Term**:
- Isozymes are different forms of an enzyme that catalyze the same reaction but differ in structure.
- Coenzymes are non-protein molecules that assist enzymes in their activity.
- Epinezyme is not a commonly used term in biochemistry.
- Zymogens are the inactive precursors of enzymes, which become active when they are modified (often by cleavage).

5. **Conclusion**: The correct term for enzymes that are secreted in an inactive state is **zymogen**.

**Final Answer**: The enzymes in inactive state are called **zymogens**.

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