Regulation of transcription

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What is Transcription?

Transcription is the process of making pre-mRNA using part of the DNA as a template as follows:
- The enzyme DNA Helicase acts on a specific region of the DNA to break the hydrogen bonds between the bases, exposing the nucleotides in that region
- the enzyme RNA polymerase moves along one of the two DNA strands known as the template strand, causing the nucleotides on this strand to join with the individual complementary nucleotides from the pool of nucleotides in the nucleus. An exposed Adenine base on the DNA will join with a Uracil nucleotide, not a thymine! However Thymine on the DNa will still join with an Adenine nucleotide!
as the RNA polymerase adds the nucleotides on at a time to the strand of pre-mRNA the DNA strands rejoin behind it.
-when the RNA polymerase reaches a triplet that it recognises as a stop code it detaches.  

Preventing expression by preventing gene


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