transcription 1

Question 1

why do we have mrna
hint - 3 reasons

Answer 1

1. better regulation
2. prevention of mistakes
3. so proteins can be made while DNA is being replicated

Question 2

why do we use uracil instead of thymine in rna

Answer 2

it is more energetically favourable and dna is disposable

Question 3

what will functions some rna molecules have and how do these come about

Answer 3

structural and catalytic function
-as it is folded into structures to allow base pairing and covalent bonding

Question 4

whats the 4 type of rna

Answer 4

rrna
trna
non coding rna
mrna

Question 5

what are the three regions of dna

Answer 5

5’ promoter region
coding region
3’control region

Question 6

what codes for the start of the coding region

Answer 6

ATG

Question 7

what codes for the end of the coding region
(3 codes)

Answer 7

TAG, TAA, TGA

Question 8

what does rna polymerase do to the DNA and what is a special feature about it (to do with how it starts)

Answer 8

it separates the two bands and uses one as a template
-it is self priming

Question 9

which way does the rna polymerase move down the gene

Answer 9

5’ to 3’

Question 10

which strand does rna make a complementary stand to

Answer 10

template strand as it 3’ to 5’

Question 11

what does the rna do during the actual mechanism of transcription

Answer 11

it unwinds the dna and makes a complementary strand and then rewinds the DNA as it goes

Question 12

what is the length of the replication bubble

Answer 12

12-14bps

Question 13

what allows the dna to stay within the rna polymerase

Answer 13

the rna-dna hybrid helix

Question 14

what happens to the polymerase when the rna is longer than 10bps long

Answer 14

the conformation changes, it tightens its grip