What is transcription?
Protein synthesis is the production of new proteins. This happens in two stages, transcription and translation
Transcription - forming mRNA from DNA
1) The DNA section to be copied (gene) is unwound by helicase, which breaks the hydrogen bonds between the complimentary strands. 2) RNA polymerase enzyme attaches to the strand just before the section to be copied3) As RNA polymerase moves along the DNA, free RNA nucleotides form hydrogen bonds with the exposed DNA strand nucleotides. This happens by complementary base pairing (A to T, U to A, G to C and C to G- as T is replaced by U in RNA). This new strand is messenger RNA (mRNA) and is a complementary copy of the DNA strand4) The mRNA now exits the nucleus and travels to a ribosome.
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