transcription Flashcards
1
Q
what is meant by transcription?
A
a complimentary mRNA copy of one gene on the DNA is created in the nucleus
2
Q
stage 1
A
DNA helicase breaks the hydrogen bonds between the bases in the two strands of DNA
3
Q
stage 2
A
this causes the DNA helix to unwind and one strand acts as a template
4
Q
stage 3
A
free mRNA nucleotides within the nucleus align opposite exposed complimentary DNA bases
5
Q
stage 4
A
the enzyme RNA polymerase joins together the adjacent RNA nucleotides, forming phosphodiester bonds, to create a new mRNA polymer chain
6
Q
stage 5
A
once one gene is copied, the mRNA is modified by having the introns spliced out, and then leaves the nucleus via the nuclear envelope pores into the cytoplasm
