Q20 / 51 · NTA Abhyas (JEE Main) 2020 · Chemistry · Biomolecules

The sequence of an mRNA molecule produced from a DNA template strand with the composition

5'-AGCTACACT-3' is

  • A
    5'-AGUGUAGCU-3'
  • Correct answer
    B
    5'-UCGAUGUGA-3'
  • C
    5'-AGTGTAGCT-3'
  • D
    5'-TCGATGTGA-3'

Solution

The two stands of DNA are complementary to each other and the bases of one stand are paired with the bases of other strand by means of hydrogen bonding, i.e., A = T and G≡C . But uracil (U) instead of thymine (T) is present in case of RNA. Thus, the sequence of base on m-RNA molecule is

DNA strand 5'-AGCTACACT-3'

m-RNA 5'-UCGAUGUCA-3'

Hence, the correct answer is option: 'B'.

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