Choose the most appropriate option about the presence of nitrogenous bases; Cytosine, 5-methyl uracil and Uracil.
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → Cytosine in both; DNA and RNA, 5-Methyl Uracil only in DNA and Uracil only in RNA
A nucleotide has three components – a nitrogenous base, a pentose sugar (ribose in case of RNA, and deoxyribose for DNA), and a phosphate group. 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 (5-methyl uracil, another chemical name for thymine). is present in DNA. Uracil is present in RNA at the place of Thymine.