8.3

Question 1

5’ capping enzyme

Answer 1

Adds protective 5’ cap to the 5’ end of the new RNA molecule

Question 2

What are the events of transcription in the correct order from beginning to end.

Answer 2

1. General transcription factors bind to the TATA box
2. RNA polymerase binds to the promoter
3. DNA is unwound and RNA polymerase begins to add complementary nucleotides to the template strand
4. An enzyme adds a 5’ cap to the 5’ end of the growing mRNA molecule
5. RNA splicing removes introns and the exons are joined together
6. When RNA polymerase transcribes a polyadenylation signal sequence, this signals proteins to cut the mRNA from the polymerase
7. At the 3’ end of the mRNA, poly-A polymerase enzyme adds the poly-A-tail

Question 3

What happens in elongation

Answer 3

adds, and splices the RNA

Question 4

What happens during Termination

Answer 4

A poly A tail is added to the end