![]() ![]() RNA polymerase uses incoming ribonucleotides to form the new mRNA strand. This is because its base sequence is identical to the synthesised mRNA, except for the replacement of thiamine bases with uracil. The other DNA strand is referred to as the coding strand. One DNA strand (the template strand) is read in a 3' to 5' (three-prime to five-prime) direction, and so provides the template for the new mRNA molecule. Figure 1 - Comparison of DNA and RNA Stages of Transcription
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