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In DNA purine nitrogen bases are :-...

In DNA purine nitrogen bases are :-

A

Uracil and Guanine

B

Guanine and Adenine

C

Adenine and cytosine

D

None

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The correct Answer is:
**Step-by-Step Solution:** 1. **Understand the Types of Nitrogen Bases:** - In DNA, nitrogen bases are classified into two categories: purines and pyrimidines. 2. **Identify Purines:** - Purines are characterized by having a double-ring structure. The two main purine bases found in DNA are: - Adenine (A) - Guanine (G) 3. **Identify Pyrimidines:** - Pyrimidines, on the other hand, have a single-ring structure. The pyrimidine bases in DNA are: - Cytosine (C) - Thymine (T) 4. **Confirm the Question:** - The question specifically asks for the purine nitrogen bases in DNA. 5. **Select the Correct Answer:** - Based on the identification, the purine nitrogen bases in DNA are adenine and guanine. Therefore, the correct answer is: - **Adenine and Guanine.** **Final Answer:** - The purine nitrogen bases in DNA are adenine and guanine. ---
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