A DNA template strand reads 3'-TAC GGA-5'. What is the sequence of the mRNA made from it?
Answer and explanation
Correct answer: A. 5'-AUG CCU-3'
- Step 1: The mRNA is complementary to the template and antiparallel to it, so the template read from the 3' end gives an mRNA read from the 5' end. Step 2. T pairs with A, A with U, C with G and G with C: TAC gives AUG, and GGA gives CCU. Answer: 5'-AUG CCU-3'. Why not the others: RNA has uracil and not thymine, it is complementary and not identical, and every base of the template is paired.
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