Transcription

Question 1

What happens during transcription?

Answer 1

The double-stranded DNA is used to make a single-stranded template that is a copy of the gene. This copy is made of mRNA.

Question 2

Step one of transcription

Answer 2

Sections of double-stranded DNA are unravelled and hydrogen bonds between complementary base pairs on the coding and non-coding strands are broken by DNA Helicase

Question 3

Step two of transcription

Answer 3

RNA polymerase binds to the promoter region of the DNA

Question 4

Step three of transcription

Answer 4

Free RNA nucleotides in the nucleus are able to form weak hydrogen bonds with complementary base pairs on the non-coding strand

Question 5

Step 4 of transcription

Answer 5

RNA polymerase catalyses condensation reactions to form phosphodiester bonds between the RNA nucleotides to make a strand of mRNA

Question 6

Step five of transcription

Answer 6

Pre-mRNA is spliced to remove non-coding introns from the gene