Can you explain the process of DNA transcription?
The first stage of gene expression is DNA transcription. Transcription is the formation of single stranded mRNA from double stranded DNA. During transcription, the enzyme DNA helicase unwinds the double helix by breaking the hydrogen bonds between the complementary DNA base pairs. Free RNA nucleotides are attracted to exposed complementary DNA bases. These RNA nucleotides are bonded by RNA polymerase to form mRNA. This mRNA leaves the nucleus, through nuclear pores, where it is attracted to the ribosome in the cytoplasm.
AM
Related Biology A Level answers
All answers ▸How is insulin secretion controlled?
Explain how changing one base in a DNA sequence may result in a non-functional protein being produced.
Explain how high absorption of salt from the diet can lead to a build-up of tissue fluid
A plant community on an extinct volcano displays the process of succession. Explain why there would be very few species at the end of the eruptive life cycle of the volcano and why rate of new species introduction would rapidly increase afterwards.