DNA and RNA contain four bases each. Which of the following bases is not present in RNA?
(i) Adenine
(ii) Uracil
(iii) Thymine
(iv) Cytosine
The answer is the option (iii). RNA is less stable genetic material due to the presence of uracil whose structure is less stable than thymine present in DNA. So, Option (iii) Thymine is the right choice.