Maintenence And Use Of Genetics

Question 1

What stops strands from sticking back together?

Answer 1

Ssb

Single something binding

Question 2

What enzyme cuts dna to allow for relaxation and stop breakage?

Answer 2

Topoisomerase

Question 3

What direction does synthesis go in?

Answer 3

5 to 3

Question 4

What do we add to carry on synthesis when it stops half way?

Answer 4

Short rna primer

Question 5

What degrades primers?

Answer 5

Exonuclease

Question 6

What’s the paradox of dna replication?

Answer 6

Dna fragments get shorter in each replication .. we have telomeres that are added as buffers

Question 7

What cells are telomeres switched off in?

Answer 7

Somatic cell- contributes to aging

Question 8

Cri du chat is a result of what mutation?

Answer 8

Indel deleation

Question 9

What are the 2 ways dna can be repaired?

Answer 9

1- direct, so remove damaged bit
2-remove a whole chunk and resynthsis

Nucleosome sliding

Question 10

What are the 3 main types of gene regulation?

Answer 10

1-tissue specific expression
2-external signals trigger gene expression
3-regulation in time and space, ie menopause