Question:
Which of the following base is not present in DNA?
Which of the following base is not present in DNA?
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DNA bases: A, T, G, C; RNA bases: A, U, G, C. Uracil replaces thymine in RNA.
Updated On: Oct 7, 2025
- Adenine
- Thymine
- Uracil
- Guanine
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The Correct Option is C
Solution and Explanation
Step 1: Recall DNA bases.
DNA contains four nitrogenous bases: Adenine (A), Thymine (T), Guanine (G), and Cytosine (C).
Step 2: RNA bases.
In RNA, uracil (U) replaces thymine and pairs with adenine.
Step 3: Analyzing options.
- (A) Adenine: Present in DNA.
- (B) Thymine: Present in DNA.
- (C) Uracil: Not present in DNA, found in RNA instead.
- (D) Guanine: Present in DNA.
Step 4: Conclusion.
Thus, uracil is not present in DNA.
Final Answer: \[ \boxed{\text{(C) Uracil}} \]
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