AIIMS 2019 Botany Transcription MCQ Question

The sequence of mRNA is generated by complementary base pairing with the coding strand of DNA, where adenine (A) pairs with uracil (U) instead of thymine (T). Therefore, the coding strand 5′AATTCAAATTAGG₃′ transcribes to mRNA as 5′AAUUCAAUUAGG₃′, which matches option A when written in the 5′ to 3′ direction. The other options are not valid mRNA sequences because they either contain incorrect bases or are in the wrong orientation. Understanding this process highlights the fundamental principle of transcription in molecular biology, where DNA serves as a template for RNA synthesis.