Question:
Identify the functional group / groups found in amino acid.
Identify the functional group / groups found in amino acid.
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An amino acid is named for the two functional groups attached to its alpha carbon.
Updated On: Nov 12, 2026
- COOH
- \(\text{CH}_{3}\)
- \(\text{NH}_{2}\)
- COOH and \(\text{NH}_{2}\)
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The Correct Option is D
Solution and Explanation
Step 1: Understanding the Concept
An \(\alpha\)-amino acid has the general formula \(\text{H}_2\text{N-CHR-COOH}\).
Step 2: Groups present
The \(\alpha\)-carbon carries an amino group \((\text{NH}_2)\), a carboxyl group \((\text{COOH})\), a hydrogen and a side chain R. R differs from one amino acid to another, and a methyl group occurs only in some.
Step 3: Conclusion
In solution the two groups exchange a proton to form a zwitterion. So the functional groups of an amino acid are COOH and \(\text{NH}_2\) together.
Final Answer:
An amino acid contains both COOH and NH2 groups. \[ \boxed{\text{(D) }\text{COOH and NH}_2} \]
An \(\alpha\)-amino acid has the general formula \(\text{H}_2\text{N-CHR-COOH}\).
Step 2: Groups present
The \(\alpha\)-carbon carries an amino group \((\text{NH}_2)\), a carboxyl group \((\text{COOH})\), a hydrogen and a side chain R. R differs from one amino acid to another, and a methyl group occurs only in some.
Step 3: Conclusion
In solution the two groups exchange a proton to form a zwitterion. So the functional groups of an amino acid are COOH and \(\text{NH}_2\) together.
Final Answer:
An amino acid contains both COOH and NH2 groups. \[ \boxed{\text{(D) }\text{COOH and NH}_2} \]
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