The functional group which found in amino acid is

Options

A. `-COOH` group
B. `-NH_(2)` group
C. `-CH_(3)` group
D. both (1) and (2)

Answer

To answer the question about the functional groups found in amino acids, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Amino Acids**:
Amino acids are the building blocks of proteins. They are organic compounds that contain both an amino group and a carboxyl group.

2. **Identifying Functional Groups**:
- **Amino Group**: This group is represented as -NH2. It is a characteristic feature of all amino acids.
- **Carboxyl Group**: This group is represented as -COOH. It is also a characteristic feature of all amino acids.

3. **Analyzing the Options**:
- **Carboxyl Group**: Present in all amino acids.
- **Amino Group**: Present in all amino acids.
- **Methyl Group**: This group (-CH3) is not found in all amino acids. It may be present in some amino acids (like alanine), but it is not a universal feature.

4. **Conclusion**:
Since both the amino group and the carboxyl group are found in all amino acids, the correct answer to the question is that both the carboxyl group and the amino group are functional groups found in amino acids.

5. **Final Answer**: The correct option is "both 1 and 2" (carboxyl group and amino group).