Question:
Identify the name of above nitrogen base.
Identify the name of above nitrogen base.
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A single-ring base with C=O at C-2 and C-4, no amino group and no methyl group is uracil.
Updated On: Nov 12, 2026
- Cytosine
- Uracil
- Thymine
- Guanine
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept
Nitrogen bases are purines (two fused rings) or pyrimidines (one ring).
The pyrimidines are cytosine, thymine and uracil.
Step 2: Analyse the structure
The structure has a single six-membered ring with two nitrogens at positions 1 and 3, so it is a pyrimidine and not guanine.
Step 3: Rule out cytosine and thymine
The ring has C=O groups at C-2 and C-4 and no \(\text{NH}_{2}\) group, so it is not cytosine.
Carbon 5 carries only hydrogen and no methyl group, so it is not thymine.
Step 4: Conclusion
The base is pyrimidine-2,4-dione, which is uracil, the base found in RNA.
Final Answer:
The base is uracil. \[ \boxed{\text{(B) }\text{Uracil}} \]
Nitrogen bases are purines (two fused rings) or pyrimidines (one ring).
The pyrimidines are cytosine, thymine and uracil.
Step 2: Analyse the structure
The structure has a single six-membered ring with two nitrogens at positions 1 and 3, so it is a pyrimidine and not guanine.
Step 3: Rule out cytosine and thymine
The ring has C=O groups at C-2 and C-4 and no \(\text{NH}_{2}\) group, so it is not cytosine.
Carbon 5 carries only hydrogen and no methyl group, so it is not thymine.
Step 4: Conclusion
The base is pyrimidine-2,4-dione, which is uracil, the base found in RNA.
Final Answer:
The base is uracil. \[ \boxed{\text{(B) }\text{Uracil}} \]
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