Question:medium

What would be the nitrogen base sequences in the m-RNA formed by the given DNA segment.
3' ATGCAGCATGACCGA 5'
5' TACGTCGTACTGGCT 3'

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The mRNA sequence is identical to the coding strand (5' to 3' DNA strand), with the sole exception that Thymine (T) is replaced by Uracil (U).
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Updated On: Jul 22, 2026
  • 3' UACGUCGUACUGGCU 5'
  • 5' AUGCAGCAUGACCGA 3'
  • 5' UACGUCGUACUGGCU 3'
  • 3' AUGCAGCAUGACCGA 5'
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The Correct Option is C

Solution and Explanation

Step 1: Pick the coding strand instead of the template.
Rather than transcribing the template strand base by base, notice that the mRNA copies the sequence of the other (coding) strand exactly, only swapping T for U.
Step 2: Take the given coding strand.
The bottom strand reads 5' TACGTCGTACTGGCT 3'.
Step 3: Swap every T for U.
Replacing each thymine with uracil turns this into 5' UACGUCGUACUGGCU 3', keeping the same 5' to 3' direction.
Final answer: Option 3, 5' UACGUCGUACUGGCU 3'.
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