Transduction and phase defence

Question 1

Define transduction

Answer 1

Bacteriophage accidedntly packaging host DNA and delivering it to another host

Question 2

What is meant by specialised transduction?

Answer 2

Will pick up a gene adjacent to the entry site only

Question 3

What is meant by generalised transduction?

Answer 3

Any gene can be transferred

Question 4

Give an example of a generalised transductor

Answer 4

P22 which infects s.typhimurium

Question 5

What are the main usages of transduction?

Answer 5

Can be used for investigating gene linkages

Question 6

What defence systems does a bacteria have against phages?

Answer 6

1. Restriction and modification systems
2. Abi systems
3. Crispr

Question 7

What are ABI defence systems?

Answer 7

Prevent phage propogation by initiating dormancy or death upon infection, therefore protecting the community

Question 8

What is the CRISP defence system

Answer 8

Acts as an adaptive immune system, where it will add spacer sequences within its genome, confusing the bacteriophage