Transcription

Cards (8)

How are proteins synthesised?
DNA -> (transcription in nucleus) -> mRNA -> (translation at ribosome) -> polypeptide
Briefly outline the process of transcription.?
One strand of DNA acts as a template for the production of mRNA, a complementary section of part of the DNA sequence. This occurs in the nucleus
What is the first step of transcription?
DNA helicase breaks the hydrogen bonds between the complementary base pairs in a specific region of DNA
What is the second step of transcription?
RNA polymerase attaches to the DNA at the beginning of the sequence, and assembles mRNA
What is the third step of transcription?
RNA polymerase joins the free RNA nucleotides together by aligning them opposite the template strand based on complementary base pairing
What direction does RNA polymerase work in?
5' to 3'. This is the direction that mRNA is made
What is the forth step of transcription?
A stop signal is reached and RNA polymerase separates from the DNA strand
What is the final step of transcription?
The introns are removed from the mRNA molecule, and it detaches from the DNA template and exits the nucleus via the nuclear pores, moving into the cytoplasm.