Question:
The sequence of nitrogenous bases in a segment of a coding strand of DNA is
5' – AATGCTAGGCAC – 3'. Choose the option that shows the correct sequence of nitrogenous bases in the mRNA transcribed by the DNA.
The sequence of nitrogenous bases in a segment of a coding strand of DNA is
5' – AATGCTAGGCAC – 3'. Choose the option that shows the correct sequence of nitrogenous bases in the mRNA transcribed by the DNA.
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mRNA is identical to the coding strand (except T → U). Transcription uses the template strand.
Updated On: Sep 13, 2025
- 5' – UUACGAACCGAG – 3'
- 5' – AAUGCUAGGCAC – 3'
- 5' – UUAACGAACCGUG – 3'
- 5' – AACGUAGGCAGC – 3'
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The Correct Option is B
Solution and Explanation
Step 1: The coding strand is given. So, the mRNA will be complementary to the template strand and identical to the coding strand (except U replaces T).
Step 2: Replace each T with U in the coding strand: AATGCTAGGCAC → AAUGCUAGGCAC.
Step 2: Replace each T with U in the coding strand: AATGCTAGGCAC → AAUGCUAGGCAC.
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