Midterm 1 T/F Flashcards Preview

Food hygiene > Midterm 1 T/F > Flashcards

Flashcards in Midterm 1 T/F Deck (22)
Loading flashcards...
1

Limulus test is suitable for detection of Gram-bacteria

T

2

Impedance measurement works with special media only

T

3

The microbial count can be determined by detecting the amount of ATP

F

4

Listeria monocytogenes’ b-haemolysis strengthens the haemolysis of Staphylococcus aureus

T

5

Salmonella colonies are reddish purple on XLD agar

T

6

Salmonella decomposes lactose

F

7

MRSV agar can be used instead of RVS broth in the enrichment procedure of Salmonella

T

8

Selective media of moulds have low pH

T

9

Enterococcus faecalis is one of the most resistant among the non-spore forming
microbes

T

10

Enterococcus faecalis is catalase positive

F

11

E.coli can ferment lactose

T

12

Enterobacteriaceae are oxidase positive

F

13

Staphylococcus aureus is cultured in Fraser broth

F Giolitti-Cantoni broth and
Baird-Parker agar

14

Positive colonies of E.coli are bluish green on TBX agar

T

15

Enterobacteriaceae cannot ferment glucose

F

16

Which statement is true for Clostridium perfringens?
1.Cultured on Sulphite cycloserine agar
2.B and C strains pathogenic for humans
3.In LS broth incubated at 25°C
4.No haemolysis on blood agar

1.T
2.F A and C strains pathogenic
3.F Incubation at 46°C
4.F Haemolysis

17

Which statement is true for Staphylococcus aureus?
1.Produces toxin between 8-45°C
2.Reduces the nitrate to nitrite
3.No haemolysis on blood agar
4.Gram negative

1.F Between 20-45°C
2.T
3.F b-Haemolysis
4.F Gram-positive

18

Which statement is true for Salmonella?
1.Indol production is negative
2.Voges-Proskauer test is positive
3.Lactose-fermentation is positive
4.H2S production is positive

1.T
2.F
3.F
4.T

19

Which statement is false for Listeria monocytogenes?
1.Catalase test is positive
2.Rhamnose negative
3.Its typical colonies on ALOA agar are blue
4.Shows summersaulting motility at 25°C

1.T
2.F
3.T
4.T

20

Which statement is false for E.coli?
1.Citrate utilization test is positive
2.Indole test is positive
3.Voges-Proskauer test is negative
4.Methyl red test is positive

1.F
2.T
3.T
4.T

21

Enterococcus faecalis can grow:
1.Between 10-60°C
2.At pH 2.6
3.At 6.5% salt concentration
4.Grow on blood agar with 70% bile content

1.F Grows between 10-45°C
2.F At pH 9.6
3.T
4.F 40% bile content.

22

Which statement is false for the water removal?
1.The microbes can multiply at certain water activity (aw) circumstances
2.The reducing of water activity inhibit the multiplication of microorganisms
3.The bacteria can grow below 0.7 aw
4.The aw requirement of bacteria is higher than the moulds

1.T
2.T
3.F Bacteria: 0.91
4.T Moulds: 0.80