3- Bacterial Genetics

Question 1

Enhanced bacterial virulence by insertion of bacteriophage into bacterial DNA ?

Answer 1

Lysogenic conversion

Question 2

Bacteria that are capable of natural transformation ?

Answer 2

Haemophilus influenza
Streptococcus pneumoniae
Bacillus species
Neisseria species

Question 3

The tra region codes for ?

Answer 3

1- Sex pili
2- Genes whose products stabilize mating pairs
3- Genes that direct conjugal DNA transfer and other genes

Question 4

Major role for site specific integration in bacteria ?

Answer 4

1- Integration of a fertility factor to make Hfr cell
2- Integration of temperate phage DNA into bacterial chromosome to create prophage
3- Movement and insertion of transposons

Question 5

Phage mediated pathogenic factors ?

Answer 5

COBEDS :
1- Cholera toxin
2- O antigens affection in salmonella
3- Botulinum toxin production in clostridium botulinum
4- Exotoxins A-C of streptococcus pyogens
5- Diphtheria toxin production in corynebacterium diphtheriae
6- Shiga toxin