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.
RH
Related Biology GCSE answers
All answers ▸Of what smaller molecules are carbohydrates made of and what is their main function in the body?
How does pH affect the rate of reaction on an enzyme?
Describe how a reflex action is coordinated.
How do you calculate the magnification of an image? For example, if the real size of a cell is 30um and the size of the cell in the textbook is 60mm, what is the magnification?