An organic molecule that has nitrogen as an element and acts as a foundation in biochemical effects are called nitrogenous bases.
They play important role in the structural organisations of DNA and RNA as both nucleic acids are composed of nitrogenous bases.
The correct answer is :
Option B. Adenine and thymine.
This can be explained as:
- The nitrogenous bases comprise purines and pyrimidines.
- Purines consist of two-carbon nitrogen ring bases. Adenine and guanine are the purines.
- Pyrimidines on the other hand contain one-carbon nitrogen ring bases. Thymine and cytosine in DNA and instead of thymine uracil in RNA are the pyrimidines.
- Universally adenine base pairs with thymine via two hydrogen pairs while guanine and cytosine bond together via three hydrogen bonds.
Therefore, adenine will base pair with thymine.
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