Topic: Transcription, genetic code, translation, protein biosynthesis· Genetics and Evolution

Which one of the following is the sequence on corresponding coding strand, if the sequence on mRNA formed is as follows5' AUCGAUCGAUCGAUCGAUCG AUCG AUCG 3'?

1. 3' ATCGATCGATCGATCGATCG ATCGATCG 5'

2. 5' UAGCUAGCUAGCUAGCUA GCUAGC UAGC 3'

3. 3' UAGCUAGCUAGCUAGCUA GCUAGCUAGC 5'

4. 5' ATCGATCGATCGATCGATCG ATCGATCG 3'

Doubtly Asked 30 Oct 2026 NEET UG 2023 Practice test neet Save WhatsApp Report

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Answer: 4. 5' ATCGATCGATCGATCGATCG ATCGATCG 3'

Key idea: The coding strand has the same sequence as the mRNA, with T in place of U.

The mRNA 5' AUCGAUCG... 3' is made from the template strand. The coding strand is complementary to the template strand, so it matches the mRNA and also runs 5' to 3'. Replacing U with T gives 5' ATCGATCG... 3'. Option 4. Option 1 has the right letters but is written 3' to 5', which is the wrong polarity for a strand identical to the mRNA. Options 2 and 3 contain U, so they cannot be DNA.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

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Which one of the following is the sequence on corresponding coding strand, if the sequence on mRNA formed is as follows5' AUCGAUCGAUCGAUCGAUCG AUCG AUCG 3'?

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