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    So during transcription in the nucleus, the DNA strand is 'unzipped' so the sequence of complementary bases can be copied and mRNA taken out of the nucleus and onto a ribosome. Is it DNA helicase which break the hydrogen bonds within the DNA or is it RNA polymerase? I though it was DNA helicase which break the hydrogen bonds/ or unzip, and the RNA polymerase which gather all the components to form the mRNA strand. Is this right, and please correct anything I've gotten wrong.

    ALSO, what is the difference between the operator gene and the promoter region? Is it that: the repressor molecule attaches to the operator gene to prevent the RNA polymerase binding, but if the repressor molecule is absent, the promoter region is where the RNA polymerase will bind? Again please correct anything which is wrong, this kinda confuses me

    Thank you
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    (Original post by ilovefruit)
    So during transcription in the nucleus, the DNA strand is 'unzipped' so the sequence of complementary bases can be copied and mRNA taken out of the nucleus and onto a ribosome. Is it DNA helicase which break the hydrogen bonds within the DNA or is it RNA polymerase? I though it was DNA helicase which break the hydrogen bonds/ or unzip, and the RNA polymerase which gather all the components to form the mRNA strand. Is this right, and please correct anything I've gotten wrong.

    ALSO, what is the difference between the operator gene and the promoter region? Is it that: the repressor molecule attaches to the operator gene to prevent the RNA polymerase binding, but if the repressor molecule is absent, the promoter region is where the RNA polymerase will bind? Again please correct anything which is wrong, this kinda confuses me

    Thank you
    DNA helicase breaks the hydrogen bonds between the complementary nitrogenous base pairs.
    RNA polymerase is involved in the formation of the mRNA strand i.e. the sugar phosphate backbone, it joins the nucleotides together.
 
 
 
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