Lab 5

Question 1

Enterobacteria can be found in the gastrointestinal tract only?

Answer 1

False (Also in genital tract, respiratory tract and in the environment)

Question 2

Enterobacteria are middle-sized Gram-positive rods?

Answer 2

False, gram negative

Question 3

Enterobacteria are obligate anaerobic bacteria?

Answer 3

False, (they are aerobic, facultative anaerobic)

Question 4

Enterobacteria are oxidase-negative bacteria?

Answer 4

True

Question 5

Shigella species are motile bacteria?

Answer 5

False, not motile

Question 6

MacConkey agar contains phenol red as a pH-indicator?

Answer 6

False, contains Drigalski agar (neutral red)

Question 7

MacConkey agar contains glucose as a carbon source?

Answer 7

False, lactose

Question 8

Pathogenic E. coli strains isolated from the gut of piglets posses F5, F17 or F41 fimbrial antigens?

Answer 8

False (F4, F6, F18=swine, F5, F17, F41 = cattle)

Question 9

E. coli can cause septicaemia in calves?

Answer 9

True

Question 10

Klebsiella species are lactose-negative bacteria?

Answer 10

False, they are lactose-positive

Question 11

Enterobacteria are Gram-negative bacteria?

Answer 11

True

Question 12

Klebsiella pneumonia is flagellated?

Answer 12

False, no flagella

Question 13

Bismuth-sulphite agar is used to isolate E. coli?

Answer 13

False, used to isolate salmonella

Question 14

E. coli strains can form capsule which were isolated from swine?

Answer 14

False, in calf (swine: haemolysis)

Question 15

Enterobacteria are fastidious bacteria?

Answer 15

False (simple)

Question 16

Oedema-disease is caused by E. coli in neonatal piglets?

Answer 16

False, in weaned piglets

Question 17

Klebsiella pneumonia cannot produce capsule?

Answer 17

False, has capsule

Question 18

Enterobacteria cloacae are a lactose-negative bacterium?

Answer 18

False, lactose positive

Question 19

E. coli is an obligate pathogenic species?

Answer 19

False (most of them are saprophytic, some are facultative pathogenic)

Question 20

E. coli is an indole-positive bacterium?

Answer 20

True