[Campbell Biology P.389] According to Figure 17.5 and the text, if a segment of a DNA templa... | Practice Question

According to Figure 17.5 and the text, if a segment of a DNA template strand is 3'-ACC-5', what would be the corresponding mRNA sequence synthesized during transcription?

  • A: 5'-UGG-3'
  • B: 5'-TGG-3'
  • C: 3'-UGG-5'
  • D: 5'-ACC-3'

Explanation

The DNA template strand 3'-ACC-5' is used to synthesize mRNA. According to base-pairing rules, A pairs with U in RNA and C pairs with G. The mRNA is synthesized antiparallel and in the 5' to 3' direction. So, 3'-ACC-5' becomes 5'-UGG-3' A->U, C->G, C->G .