A DNA template strand reads 3'-TACGCTAAA-5'. What is the mRNA sequence transcribed from it, written 5' to 3'?
Answer and explanation
Correct answer: C. 5'-AUGCGAUUU-3'
- Step 1: Pair the bases A-U, T-A, G-C and C-G along the template.
- Step 2: 3'-TACGCTAAA-5' gives 5'-AUGCGAUUU-3'.
Answer
5'-AUGCGAUUU-3'.
Why not the others: 5'-ATGCGATTT-3': this is a DNA strand; RNA uses uracil instead of thymine. 5'-UACGCUAAA-3': the template was copied with U for T, without pairing. 5'-UUUAGCGUA-3': the pairing is correct but the direction is reversed.
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