Biology
Nitrogenous bases are important components of DNA. They are formed by the combination of purines and pyrimidines with the help of hydrogen bonds. Which of the following options shows an incorrect combination ?
- Adenine = Thymine
- Guanine ≡ Cytosine
- Cytosine ≡ Guanine
- Thymine = Cytosine
Chromosomes
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Answer
Thymine = Cytosine
Reason — Purines pair with pyrimidines. Since, thymine and cytosine both are pyrimidines, they can't pair with each other. Thymine pairs with Adenine.
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