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Food Hygene > Midterm I > Flashcards

Midterm I Flashcards

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1
Q 
Which statement is True for Salmonella?
A. Indolproductionisnegative
B. Voges-Proskauer test is positive
C. Lacotse-Fermentationispositive
D. H2S production is positive
A

A + D

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2
Q

Which
statement is False for Listeria monocytogenes?
A. Catalasetestispositive
B. Rhamnose negative
C.Its typical colonieson ALOA agarare blue
D. Shows summer saulting motility at 25°C

A

B. Rhamnose negative

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3
Q 
Which statement is False for E.coli?
A.Citrate utilization test is positive
B. Indole test is positive
C. Voges-Proskauertestisnegative
D. Methyl red test is positive
A

A.Citrate utilization test is positive

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4
Q

Which
statement if False?
A. Limulus test is suitable for detectionof 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

A

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

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5
Q

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

A

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

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6
Q

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

A

C. Salmonella decomposes lactose

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7
Q 
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

A. Cultured on Sulphite cycloserine agar

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8
Q

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

A

C. Enterococcus faecalis is catalase positive

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9
Q 
Which statement is True for Staphylococcus aureus?
A. Produces toxin between 8-45
B. Reduces the nitrate to nitrite
C. No haemolysis on bloodagar 
D. Gram negative
A

B. Reduces the nitrate to nitrite

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10
Q

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

A

C. It has higher resolution capacities than liquid chromatography

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11
Q

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

A

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

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12
Q

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

A

B. They are obligate pathogens

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13
Q

Which statement is True for Pseudomonas aeruginosa?
A. Grampositive, 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

A

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

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14
Q

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

A

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

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15
Q

Which statement is False for heterophic 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

A. Determined at 15°C and 37°C

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16
Q

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

A. Associated with a more or less fecal contamination

17
Q

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

A

C. The effectiveness of the preservatives depends on concentration temperature

18
Q

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 0.8Aw
D. The Aw requirement of bacteria is lower than the moulds

A

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

19
Q

Which statement is True for the heat treatment?
A. All of the vegetative cells can bee liminated with 60C heat treatment
B. Enterococcus can survive the 80°C 30 min. heat treatment
C. All the spores can bee liminated with80°C heat treatment
D. The most commonly used preservation method in the food industry

A

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

20
Q 
The typical spoilage flora of meat products are?
A. Moulds
B. Yeasts
C. Micrococci, Lactobacilli
D. Salmonella spp.
A

C. Micrococci, Lactobacilli

21
Q 
The typical spoilage flora of bakery products are?
A. Moulds
B. Lactobacilli
C. Yeasts
D. Clostridium botulinum
A

A. Moulds

22
Q

What are characteristic of indicator organisms?
A. Should be informative in all types of waters?(drinkingwater,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

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

23
Q

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

A

C. As an indicator of fecal contamination can be used

24
Q

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

A

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

25
Q

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

A

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

26
Q

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

A

B. Direct indicators of fecal contamination nor have health ris

27
Q

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

A

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

28
Q

Which statement is False for the water removal?
A. The microbes can multiply at certain water activity circumstances
B. The reducing of water activity inhibits the multiplication of microorganisms
C. The bacteria can grow below 0.7 Aw
D. The Aw requirement of bacteria is higher than the moulds

A

D. The Aw requirement of bacteria is higher than the moulds

29
Q

Which statement is False for the heat treatment?
A. All of the vegetative cells can bee liminated with 60°C heat treatment
B. Enterococcus can survive the 60°C 30 min. heat treatment
C. All the spores cannot bee liminated with80°C heat treatment
D. The most commonly used preservation method in the food industry

A

A. All of the vegetative cells can bee liminated with 60°C heat treatment

30
Q

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

A

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

31
Q

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

A

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

Food Hygene (3 decks)

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