Describe how mRNA is produced in the nucleus of a cell
Helicase (an enzyme) breaks the hydrogen bonds between the DNA resulting in two strands. Only one strand acts as a template. RNA nucleotides attracted to exposed bases according to base pairing rules (A-U, G-C). RNA polymerase joins nucleotides together.
RN
Related Biology A Level answers
All answers ▸Explain how the human eye has both high sensitivity and high acuity.
What is the difference between transcription and translation?
When a vaccine is given to a person, it leads to the production of antibodies against a disease-causing organism. Describe how. (5 marks)
Outline the circulation of blood and the physical changes of the heart during the cardiac cycle.