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Flashcards in Midterm 1 mpq Deck (37)
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1

Which statement is True for Salmonella?
A. Indol production is negative
B. Voges-Proskauer test is positive
C. Lacotse-Fermentation is positive
D. H2S production is positive

A. Indol production is negative
D. H2S production is positive

2

Which statement is False for Listeria monocytogenes?
A. Catalase test is positive
B. Rhamnose negative
C. Its typical colonies on ALOA agar are blue
D. Shows summer saulting motility at 25°C

B. Rhamnose negative

3

Which statement is False for E.coli?
A. Citrate utilization test is positive
B. Indole test is positive
C. Voges-Proskauer test is negative
D. Methyl red test is positive

A. Citrate utilization test is positive

4

Enterococcus faecalis can grow:
A. Between 10-60°C
B. At pH 2.6
C. At 6.5% salt concentration
D. Grow on blood agar with 70% bile content

C. At 6.5% salt concentration

5

Which statement if False?
A. Limulus test is suitable for detection of Gram-bacteria
B. Impedance measurement works with special media only
C. The microbial count can be determined by detecting the amount of ATP
D. The redox potential of the medium decreases during the bacterial growth

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

6

Which statement is True?
A. Enterococcus faecalis is catalase positive
B. Staphylococcus aureus is cultured in Fraser broth
C. Positive colonies of E.coli are bluish green on TBX agar
D. Enterobacteriaceae cannot ferment glucose

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

7

Which statement is False?
A. Listeria monocytogenes’ b-haemolysis strengthens the haemolysis of
Staphylococcus aureus
B. Salmonella colonies are reddish purple on XLD agar
C. Salmonella decomposes lactose
D. MRSV agar can be used instead of RVS broth in the enrichment procedure of
Salmonella

C. Salmonella decomposes lactose

8

Which statement is True for Clostridium perfringens?
A. Cultured on Sulphite cycloserine agar
B. B and C strains pathogenic for humans
C. In LS broth incubated at 25°C
D. No haemolysis on blood agar

A. Cultured on Sulphite cycloserine agar

9

Which statement is False?
A. Selective media of moulds have low pH
B. Enterococcus faecalis is one of the most resistant among the non-spore forming
microbes
C. Enterococcus faecalis is catalase positive
D. E.coli can ferment lactose

C. Enterococcus faecalis is catalase positive

10

Which statement is True for Staphylococcus aureus?
A. Produces toxin between 8-45
B. Reduces the nitrate to nitrite
C. No haemolysis on blood agar
D. Gram negative

B. Reduces the nitrate to nitrite

11

What are the suitability of sampling based on suspicion and annual monitoring plan?
Write the letters to the adequate line:
A) It is used to inspect the cause of foodborne disease
B) It is used to determine the drug residues in the food
C) It is used to investigate the chemical contaminants of the food
D) It is used to detect the poisonous source

Sampling based on suspicion: A, D
Sampling based on monitoring plan: B, C

12

Classify the different screening methods:
A) Meatsafe test
B) KIS test
C) Brilliant black reduction test
D) Snap test

Microbial growth inhibition test: KIS, Brilliant black reduction test – B, C
Receptor based tests: Snap-test, Meatsafe test – A, D

13

What is the quantity of one sample based on the legal regulation in case of the foods
below? Pair the sample with the adequate quantity:
A) Turkey meat
B) Stone fruit
C) Mammal fat
D) Cow milk

500ml: Cow milk
500g: Turkey meat, Mammal fat
1kg: Stone fruit

14

What are characteristics to the objective inspection program and the selective control?
Write the letters to the adequate line
A. It is used to survey attributes of food
B. It is used to screen the non-compliant items occurring rarely
C. The sample is selected by targeted risk evaluation
D. The results of the investigation are valid for the whole population

Objective inspection program: A, D
Selective control: B, C

15

Classify the different screening methods:
A. Rosa test
B. Delvotest
C. Four plate method
D. Beta star test

Microbial growth inhibition method: B, C
Receptor based test: A, D

16

What is the quantity of one sample based on the legal regulation in case of foods below?
Pair the sample with the adequate quantity
A. Mammal meat
B. Pulse (leguminous)
C. Sausage
D. Milk

500ml: Milk
500g: Mammal meat, Sausage
1kg: Pulse

17

What is not true for gas chromatography?
A. It is not suitable for analyzing inorganic materials
B. Heat sensitive materials can also be analyzed
C. It has higher resolution capacities than liquid chromatography
D. It can be connected with mass spectrometric detection

C. It has higher resolution capacities than liquid chromatography

18

What is the main bottleneck of molecular spectroscopy?
A. Detection and quantification levels are not low enough
B. It is not suitable for analyzing solid samples
C. Only one compound can give signal in the given wavelength
D. It requires too high amount of analytical sample

C. Only one compound can give signal in the given wavelength

19

What are not characteristic of indicator organisms?
A. Should be informative in all types of waters? (drinking water, lake, river, seaweed,
wastewater etc.)
B. They are obligate pathogens
C. Characterized by longer survival time than the general enteral pathogenic
microbes
D. Their quantity must show direct correlation with the degree of fecal
contamination

B. They are obligate pathogens

20

Which statement is True for Pseudomonas aeruginosa?
A. Gram positive, rod shaped, oxidase positive, non-spore forming bacterium
B. Occurs in feces, soil, water and waste water
C. As an indicator of fecal contamination can be used
D. Provides information about defects of filtering process

B. Occurs in feces, soil, water and waste water

21

Which statement is False for Sulphite reducing Clostridia and Clostridium perfringes?
A. Obligate anaerobic, spore forming bacteria
B. Most representative is Clostridium botulinum, which is natural member of fecal microflora
C. Spore can survive in the water for long time and are highly resistant to disinfection
D. Presence in drinking water indicates the possibility of protozoa cysts and defects of filtering process

B. Most representative is Clostridium botulinum, which is natural member of fecal microflora

22

Which statement is False for heterotrophic aerobic bacteria?
A. Determined at 15°C and 37°C
B. Long term examination can be used for control the treatment of water
C. Sudden increase in the number refers to a defect in the water treatment
D. Carried out by pour plate method

A. Determined at 15°C and 37°C

23

Which statement is True for total coliforms?
A. Associated with a more or less fecal contamination
B. Direct indicators of fecal contamination nor have health risk
C. Presence in drinking water indicates the possibility of protozoa cysts
D. Belonging to the Streptococcaceae family

A. Associated with a more or less fecal contamination

24

Which statement is True for the organic acids as preservatives?
A. Usually these substances have bactericide effect
B. The organic acids are effective in dissociated form
C. The effectiveness of the preservatives depends on concentration temperature
D. At low pH value the degree of dissociation is higher

C. The effectiveness of the preservatives depends on concentration temperature

25

Which statement is True for the water removal?
A. The microbes can multiply at each water activity circumstances
B. The reducing of water activity inhibits the multiplication of microorganisms
C. The bacteria can grow below 0.8 Aw
D. The Aw requirement of bacteria is lower than the moulds

B. The reducing of water activity inhibits the multiplication of microorganisms

26

Which statement is True for the heat treatment?
A. All of the vegetative cells can be eliminated with 60c heat treatment
B. Enterococcus can survive the 80°C 30 min. heat treatment
C. All the spores can be eliminated with 80°C heat treatment
D. The most commonly used preservation method in the food industry

D. The most commonly used preservation method in the food industry

27

The typical spoilage flora of meat products are?
A. Moulds
B. Yeasts
C. Micrococci, Lactobacilli
D. Salmonella spp.

C. Micrococci, Lactobacilli

28

The typical spoilage flora of bakery products are?
A. Moulds
B. Lactobacilli
C. Yeasts
D. Clostridium botulinum

A. Moulds

29

What are characteristic of indicator organisms?
A. Should be informative in all types of waters? (drinking water, lake, river, seaweed, wastewater etc.)
B. They are obligate pathogens
C. Characterized by shorter survival time than the general enteral pathogenic microbes
D. Their quantity does not show direct correlation with the degree of fecal contamination

A. Should be informative in all types of waters? (drinking water, lake, river, seaweed, wastewater etc.)

30

Which statement is False for Pseudomonas aeruginosa?
A. Gram negative, rod shaped, oxidase positive, non-spore forming bacterium
B. Occurs in feces, soil, water and waste water
C. As an indicator of fecal contamination can be used
D. Provides information about the general cleanliness of the water distribution
system

C. As an indicator of fecal contamination can be used

31

Which statement is True for Sulphite reducing Clostrdia and Clostridium perfringes?
A. Obligate aerobic, spore forming bacteria
B. Most representative is clostridium botulinum, which is natural member of fecal microflora
C. Spore can survive in the water for long time and are highly resistant to disinfection
D. Provides information about the general cleanliness of the water distribution system

C. Spore can survive in the water for long time and are highly resistant to disinfection

32

Which statement is True for heterotrophic aerobic bacteria?
A. Determined at 15°C and 37°C
B. Long term examination can be used for control the treatment of water
C. Sudden increase in the number refers to a fecal contamination in the water treatment
D. Carried out by MPN method

B. Long term examination can be used for control the treatment of water

33

Which statement is False for total coliforms?
A. Associated with a more or less fecal contamination
B. Direct indicators of fecal contamination nor have health risk
C. Provide good information on the microbiological status of the water
D. Belonging to the Enterobacteriaceae family

B. Direct indicators of fecal contamination nor have health risk

34

Which statement is False for the organic acids as preservatives?
A. Usually these substances have bacteriostatic effect
B. The organic acids are effective in undissociated form
C. The effectiveness of the preservatives depends on concentration temperature
D. At low pH value the degree of dissociation is higher

D. At low pH value the degree of dissociation is higher

35

Which statement is False for the heat treatment?
A. All of the vegetative cells can be eliminated with 60°C heat treatment
B. Enterococcus can survive the 60°C 30 min. heat treatment
C. All the spores can not be eliminated with 80°C heat treatment
D. The most commonly used preservation method in the food industry

A. All of the vegetative cells can be eliminated with 60°C heat treatment

36

What part of the electromagnetic radiation spectrum can be used for analytical
purposes?
A. Only the ultraviolet and the visible parts
B. The ultraviolet, visible and near infrared parts
C. The ultraviolet, visible, infrared and the x-ray parts
D. The whole spectrum can be used

C. The ultraviolet, visible, infrared and the x-ray parts

37

The main bottleneck of mass spectrometry?
A. Detection and quantification levels are not low enough
B. It is not suitable for analyzing solid samples
C. It is suitable only for structure analysis of chemically clean materials
D. It requires too high amount of analytical sample

C. It is suitable only for structure analysis of chemically clean materials