Question:
Which from following nitrogen bases either of purine or pyrimidine does NOT contain \(-\text{NH}_2\) group attached with its ring?
Which from following nitrogen bases either of purine or pyrimidine does NOT contain \(-\text{NH}_2\) group attached with its ring?
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A quick memory trick:
• Adenine, Guanine and Cytosine contain \(-\text{NH}_2\) group.
• Thymine does not contain \(-\text{NH}_2\) group.
• Adenine, Guanine and Cytosine contain \(-\text{NH}_2\) group.
• Thymine does not contain \(-\text{NH}_2\) group.
Updated On: May 14, 2026
- Adenine
- Thymine
- Guanine
- Cytosine
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Verified By Collegedunia
The Correct Option is B
Solution and Explanation
Concept:
Nitrogenous bases are of two types:
• Purines: Adenine and Guanine
• Pyrimidines: Cytosine, Thymine and Uracil Some of these bases contain an amino group \((-\text{NH}_2)\) attached to the ring, while some do not.
Step 1: Check adenine.
Adenine contains an amino group \((-\text{NH}_2)\).
Step 2: Check guanine and cytosine.
Guanine also contains an amino group \((-\text{NH}_2)\). Cytosine also contains an amino group \((-\text{NH}_2)\).
Step 3: Check thymine.
Thymine does not contain an amino group attached to its ring. Hence, the correct answer is:
\[ \boxed{(B)\ \text{Thymine}} \]
Nitrogenous bases are of two types:
• Purines: Adenine and Guanine
• Pyrimidines: Cytosine, Thymine and Uracil Some of these bases contain an amino group \((-\text{NH}_2)\) attached to the ring, while some do not.
Step 1: Check adenine.
Adenine contains an amino group \((-\text{NH}_2)\).
Step 2: Check guanine and cytosine.
Guanine also contains an amino group \((-\text{NH}_2)\). Cytosine also contains an amino group \((-\text{NH}_2)\).
Step 3: Check thymine.
Thymine does not contain an amino group attached to its ring. Hence, the correct answer is:
\[ \boxed{(B)\ \text{Thymine}} \]
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