Gram Negative Rods

Question 1

Facultative anaerobic gram negative rods bacteria

Answer 1

Haemophilus

Question 2

Haemophilus found in oral cavity

Answer 2

H.parainfluenza

H.parahaemolyticus

Question 3

Haemophilus need special growth factors

Answer 3

Haemin (X-factor)

NAD (V-factor )

Question 4

Co2 dependent gram negative rods

Answer 4

Capnophilic ( capnocytophaga)

Question 5

Types of capnocytophaga

Answer 5

C.gingivalis
C.granulosa
C.haemolytica

Question 6

Asaccharolytic gram negative rods

Answer 6

Porphyromonas

Question 7

What growth source of Porphyromonas gingivalis?

Answer 7

Protein and peptides by
1-destruction of tissues
2-subversion of the hosr defences

Question 8

P.gingivalis destruction the tissues by

Answer 8

produce protases ( degrade Ig , complement , iron , haeme , glycoproteins)
Haemolysin ( collagen degrading enzyme)
Cytotoxic metabolites
Capsule

Question 9

Name of Porphyromonas recoverd in root canal infection?

Answer 9

P.endodontalis

Question 10

Name of Porphyromonas found in healthy sites

Answer 10

P.catonia

Question 11

Fusobacterium characteristically by

Answer 11

Produce butyric acid

Question 12

Subspecies of Fusobacterium

Answer 12

F.nucleatum (most common)
F.polymorphum
F.vincentii

Question 13

F.nucleatum can cause the odour with halitosis,why ?

Answer 13

Remove sulphide from cystine and methionine to produce ammonia,butyrate, h sulphide,methyl mercaptan

Question 14

How Fusobacterium produce energy?

Answer 14

Catabolise a.a such as aspartat ,glutamate,lysine,histidine