Question:
Which nitrogenous base is not present in DNA?
Which nitrogenous base is not present in DNA?
Updated On: Sep 23, 2026
- Thymine
- Uracil
- Adenine
- Guanine
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept:
DNA and RNA both contain purine bases (Adenine, Guanine) and pyrimidine bases, but they differ in one pyrimidine base.
Step 2: Comparing DNA and RNA Bases:
DNA contains Adenine, Guanine, Cytosine and Thymine. RNA contains Adenine, Guanine, Cytosine and Uracil in place of Thymine.
Step 3: Identifying the Answer:
Since Uracil replaces Thymine only in RNA, Uracil is the base that is absent from DNA.
Final Answer:
\(\text{Uracil}\)
DNA and RNA both contain purine bases (Adenine, Guanine) and pyrimidine bases, but they differ in one pyrimidine base.
Step 2: Comparing DNA and RNA Bases:
DNA contains Adenine, Guanine, Cytosine and Thymine. RNA contains Adenine, Guanine, Cytosine and Uracil in place of Thymine.
Step 3: Identifying the Answer:
Since Uracil replaces Thymine only in RNA, Uracil is the base that is absent from DNA.
Final Answer:
\(\text{Uracil}\)
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