Q. Which one of the following pairs of nitrogenous bases of nucleic acids, is wrongly matched with the category mentioned against it?

Q. Which one of the following pairs of nitrogenous bases of nucleic acids, is wrongly matched with the category mentioned against it?

1. Guanine, adenine – Purines
2. Adenine, thymine – Purines
3. Thymine, uracil – Pyrimidines
4. Uracil, cytosine – Pyrimidines

Solution :

Correct option : B Nucleic acids like DNA and RNA are made up of polymers of nucleotides. Nucleotides consists of two groups: purine and pyrimidine. Purine are adenine and guanine whereas pyrimidine are cytosine, thymine and uracil.