Which one of the following is the sequence on corresponding coding strand, if the sequence on mRNA formed is as follows: 5' AUCGAUCGAUCGAUCGAUCGAUCGAUCG 3'?
3' ATCGATCGATCGATCGATCGATCGATCG 5'
5' UAGCUAGCUAGCUAGCUAGCUAGCUAGC 3'
3' UAGCUAGCUAGCUAGCUAGCUAGCUAGC 5'
5' ATCGATCGATCGATCGATCGATCGATCG 3'
the coding strand has the polarity 5'→3' and the sequence is the same as RNA (except that thymine is present in place of uracil). Therefore, if the mRNA sequence is 5'-AUCG...-3', the coding strand will be 5'-ATCG...-3'. The strand with 3'→5' polarity acts as the template.
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