Which of the following nitrogenous bases is found in ribonucleic acid but is replaced by thymine in deoxyribonucleic acid?

💡 Solution & Explanation

Uracil is a pyrimidine nitrogenous base present in RNA that pairs with adenine, whereas DNA contains thymine instead of uracil, which provides structural stability and error-checking capabilities during DNA replication. Adenine and guanine are purines found in both nucleic acids, while cytosine is a pyrimidine common to both DNA and RNA. James Watson and Francis Crick elucidated the double helical structure of DNA in 1953. Genetic information is transcribed from DNA into messenger RNA.