A DNA template strand has the base sequence TAC GGA. What is the base sequence of the mRNA transcribed from it?

Answer and explanation

Correct answer: B. AUG CCU

  1. Step 1: mRNA is complementary to the template: T-A, A-U, C-G, G-C, G-C, A-U.
Answer
AUG CCU.
Why not the others: ATG CCT: RNA contains uracil, not thymine. UAC GGA: this is a copy of the template, not its complement. AUG CCA: the last base pairs with A on the template, so it must be U, not A.

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