Question:
Which of the following nitrogen bases in nucleic acids contains two keto groups?
Which of the following nitrogen bases in nucleic acids contains two keto groups?
Show Hint
Thymine has C=O groups at positions 2 and 4 of the pyrimidine ring.
Updated On: Nov 12, 2026
- Adenine
- Guanine
- Thymine
- Cytosine
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Verified By Collegedunia
The Correct Option is C
Solution and Explanation
Step 1: Understanding the Concept
Nucleic acid bases are purines (adenine, guanine) and pyrimidines (cytosine, thymine, uracil).
Step 2: Count C=O groups
Adenine has none. Guanine has one at C-6. Cytosine has one at C-2.
Step 3: Thymine
Thymine (5-methyluracil) has keto groups at C-2 and C-4, so it has two.
Final Answer:
Thymine contains two keto groups. \[ \boxed{\text{(C) }\text{Thymine}} \]
Nucleic acid bases are purines (adenine, guanine) and pyrimidines (cytosine, thymine, uracil).
Step 2: Count C=O groups
Adenine has none. Guanine has one at C-6. Cytosine has one at C-2.
Step 3: Thymine
Thymine (5-methyluracil) has keto groups at C-2 and C-4, so it has two.
Final Answer:
Thymine contains two keto groups. \[ \boxed{\text{(C) }\text{Thymine}} \]
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