3. Transcription

Question 1

define transcription

Answer 1

where the DNA code is transcribed into a single strand of RNA called mRNA

Question 2

where does transcription take place

Answer 2

the nucleus of cells

Question 3

outline the steps of transcription

Answer 3

1. RNA polymerase binds at the start codon
2. RNA helicase breaks the hydrogen bonds on the specific section of DNA needed
3. this exposes the bases
4. free floating nucleotides attach to the bases via complimentary base pairing
5. DNA polymerase joins these bases to the nucleotides, forming a pre-mRNA strand
6. as RNA polymerase moves along the DNA strands reform hydrogen bonds on their own
7. RNA polymerase will stop at a stop codon
8. pre-mRNA is then spliced, removing the introns, before leaving the nucleus via the nuclear pores

Question 4

what are the coding sections of DNA called?

Answer 4

exons

Question 5

what are the non-coding sections of DNA called?

Answer 5

introns