Nage 3

Question 1

Name 3 difference between DNA and RNA

Answer 1

RNA has ribose sugar DNA has deoxyribose sugar
In RNA, thymine is replaced with Uracil
RNA is single stranded and DNA is double stranded

Question 2

Explain what is meant by transcription, hat it is crucial for and which enzyme it requires

Answer 2

Transcription is the production of mRNA from DNA and it is crucial for protein synthesis. It uses the enzymes RNA polymerase

Question 3

List the different RNA polymerase and what they are responsible for

Answer 3

RNA Polymerase 1 - rRNA
RNA polymerase 2 - mRNA
RNA polymerase 3 - snRNA

Question 4

Explain what is meant by ‘gene promoter’

Answer 4

This is a sequence of DNA usually found 40 bp before a gene here where transcription factors can bind onto and increase or decrease the chances of transcribing the gene

Question 5

What is the gene promoter for RNA polymerase 2 and what complex does it form

Answer 5

The gene promoter is TATA and it binds onto transcription factors 2 D A B, then RNA polymerase 2, then F J E H forming the basal complex