gram negative bacteria

Question 1

colour of gram negatuve

Answer 1

pink
because they can’t retain the stain`

Question 2

what are pathogenicity determinants

Answer 2

virulence determinants/factors

any product or strategy that contributes to pathogenicity/ virulence

can include colonisations factors and toxins

Question 3

4 examples of colonisation factors

Answer 3

adhesins

invasins

nutrient acquisition

defence against the host

Question 4

describe toxins

Answer 4

usually secreted proteins

cause
-damage
-subversion

Question 5

anaerobic gram negatuve rod

Answer 5

bacteroides

Question 6

aerobic gram negative rods

Answer 6

coliforms

pseudomonads

vibrio

parvobacteria

Question 7

describe coliforms

Answer 7

rod shaped
motile
facultatively anaerobic
colonise the intestinal tract

Question 8

diagnostic characteristics of pathogenic enterobacteria

Answer 8

look at metabolic processes of bacteria

lactose fermentation produces acids

Question 9

what does enterobacteriaceae consist of

Answer 9

multiple gram negative rod shaped bacterial species

Question 10

what are The four major groups (phyla) of gram-negative pathogens

Answer 10

Proteobacteria
Bacteroids
Chlamydia
Spirochaetes

Question 11

shape of proteobacteria

Answer 11

all are rod shaped

Question 12

shape of bacteroids

Answer 12

rod shaped

Question 13

shape of chlamydia

Answer 13

round pleimorphic

Question 14

shape of spirochaetes

Answer 14

spiral/ helical

Question 15

why can a pathogen be difficult to culture on a lab

Answer 15

because of the dependency of the pathogen on its host