Past qs Lab6

Question 1

Enterobacteria can be found in the GI 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 possess F5, F17 or F41 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 cloaceae 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