Which of the functional group(s) is/are present in the amino acids ?

Options

A. `-NH_2`
B. `-COOH`
C. `-COOR`
D. (1) and (2)

Answer

To determine which functional groups are present in amino acids, we can follow these steps:

### Step 1: Identify the Functional Groups
Amino acids are organic compounds that contain specific functional groups. The two primary functional groups present in amino acids are:
- **Amino Group (NH2)**: This group consists of a nitrogen atom bonded to two hydrogen atoms.
- **Carboxyl Group (COOH)**: This group consists of a carbon atom double-bonded to an oxygen atom and single-bonded to a hydroxyl group (OH).

### Step 2: Analyze the Structure of Amino Acids
The general structure of an amino acid can be represented as follows:
- A central carbon atom (C) is bonded to:
- An amino group (NH2)
- A carboxyl group (COOH)
- A hydrogen atom (H)
- A variable side chain (R) that differs among different amino acids.

### Step 3: Confirm the Presence of Functional Groups
From the general structure:
- The **amino group (NH2)** is clearly present.
- The **carboxyl group (COOH)** is also clearly present.
- The **ester group (COOR)** is not present in amino acids.

### Step 4: Conclusion
Based on the analysis:
- The amino group (NH2) and carboxyl group (COOH) are present in amino acids.
- The ester group (COOR) is not present.

Thus, the correct answer is that both the amino group and the carboxyl group are functional groups present in amino acids.

### Final Answer:
The functional groups present in amino acids are:
1. Amino Group (NH2)
2. Carboxyl Group (COOH)