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  • Given below is the sequence of the coding strand of DNA in a transcription unit 3 'A A T G C A G C T A T T A G G – 5' write the sequence of a) its complementary strand b) the mRNA.

Given below is the sequence of the coding strand of DNA in a transcription unit 3 'A A T G C A G C T A T T A G G – 5' Write the sequence of a) its complementary strand b) the mRNA.

Answers (1)

(a) The complementary strand is formed by pairing each base in the coding strand with its complementary base:

  • A pair with T
  • T pairs with A
  • G pairs with C
  • C pairs with G

Thus, the complementary (template) strand is 5' T T A C G T C G A T A A T C C 3'

(b) During transcription, the mRNA is synthesized using the template strand. The mRNA is complementary to the template strand, and uracil (U) replaces thymine (T) in RNA. The mRNA sequence is 5' A A U G C A G C U A U U A G G 3'

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