The destruction of the biological nature and activity of proteins by heat or chemical agent is called

Options

A. dehydration
B. denaturation
C. denitrogenation
D. deamination

Explanation

To solve the question regarding the destruction of the biological nature and activity of proteins by heat or chemical agents, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks for the term that describes the process where proteins lose their biological nature and activity due to heat or chemical agents.

2. **Identifying Key Terms**: The key terms here are "destruction," "biological nature," "activity of proteins," "heat," and "chemical agents." These terms suggest a process that alters the structure of proteins.

3. **Reviewing Options**: The options provided are:
- A) Denitration
- B) Denaturation
- C) Denitrogenation
- D) Amination

4. **Analyzing Each Option**:
- **Denitration**: This refers to the removal of nitrogen from a compound, which is not related to proteins.
- **Denaturation**: This is a well-known process where proteins lose their secondary and tertiary structures due to external stressors like heat or chemicals, leading to loss of function.
- **Denitrogenation**: This term is not commonly used in the context of proteins and refers to the removal of nitrogen.
- **Amination**: This refers to the introduction of an amino group into a compound, which is not related to the destruction of proteins.

5. **Choosing the Correct Answer**: Based on the analysis, the correct answer is **B) Denaturation**. Denaturation specifically describes the process where proteins lose their structure and function due to heat or chemical agents.

6. **Conclusion**: The destruction of the biological nature and activity of proteins by heat or chemical agents is called **denaturation**.

### Final Answer:
The correct answer is **B) Denaturation**.