Question:
Which of the following nitrogenous bases is NOT found in DNA?
Which of the following nitrogenous bases is NOT found in DNA?
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Remember: DNA contains Thymine (T), whereas RNA contains Uracil (U) instead of Thymine.
Updated On: Jun 15, 2026
- Adenine
- Cytosine
- Thymine
- Uracil
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The Correct Option is D
Solution and Explanation
Concept:
DNA (Deoxyribonucleic Acid) is the genetic material responsible for storing and transmitting hereditary information.
DNA contains four nitrogenous bases:
Adenine (A)
Thymine (T)
Guanine (G)
Cytosine (C)
Step 1: Recall the base pairing rule. In DNA: \[ A \leftrightarrow T \] \[ G \leftrightarrow C \] These complementary pairs maintain the double-helical structure.
Step 2: Identify the role of uracil. Uracil is not present in DNA. Instead, it is present in RNA (Ribonucleic Acid), where it replaces thymine. In RNA: \[ A \leftrightarrow U \]
Step 3: Choose the correct option. Since DNA contains thymine but not uracil, the base absent from DNA is: Uracil
Step 1: Recall the base pairing rule. In DNA: \[ A \leftrightarrow T \] \[ G \leftrightarrow C \] These complementary pairs maintain the double-helical structure.
Step 2: Identify the role of uracil. Uracil is not present in DNA. Instead, it is present in RNA (Ribonucleic Acid), where it replaces thymine. In RNA: \[ A \leftrightarrow U \]
Step 3: Choose the correct option. Since DNA contains thymine but not uracil, the base absent from DNA is: Uracil
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