How many types of nitrogenous bases are present in nucleic acids ?
Answer & explanation
Correct answer: option 3
There are two types of nitrogenous bases – Purines
(Adenine and Guanine), and Pyrimidines (Cytosine, Uracil and Thymine).
Cytosine is common for both DNA and RNA and Thymine is present in
DNA. Uracil is present in RNA at the place of Thymine.