The functional group which is found in amino acid is:

Options

A. `-COOH`
B. `-NH_(2)`
C. `-CH_(3)`
D. Both (a) and (b)

Answer

To determine the functional groups found in amino acids, we can follow these steps:

### Step 1: Understand the Structure of Amino Acids
Amino acids have a general structure that can be represented as RCH(NH2)COOH. Here, R represents a variable side chain that differs among different amino acids.

### Step 2: Identify the Functional Groups
In the general structure of amino acids:
- The **amino group** is represented by NH2. This group is responsible for the basic properties of amino acids.
- The **carboxylic group** is represented by COOH. This group gives amino acids their acidic properties.

### Step 3: Conclusion
From the analysis, we can conclude that the functional groups present in amino acids are:
1. Amino group (NH2)
2. Carboxylic group (COOH)

### Step 4: Answer the Question
Based on the identification of the functional groups, the correct answer to the question is that both the amino group and the carboxylic group are found in amino acids. Therefore, if given options, both A (amino group) and B (carboxylic group) would be correct.

### Final Answer
The functional groups found in amino acids are the amino group (NH2) and the carboxylic group (COOH).

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