FH1 mt 1 Flashcards
What is the effect of increasing NaCl concentration on water activity ?
- It has no effect on water activity
- It is increasing the water activity
- It is decreasing the water activity
- The effect on water activity is not linear
- It is decreasing the water activity
Which group of these microorganisms can multiply at the highest water activity level ?
- Gram positive bacteria
- Gram negative bacteria
- Yeasts
- Moulds
- Gram negative bacteria
Choose the correct statement !
- Except infants, the botulinum toxin is produced in the food
- The botulinum toxin is produced in the GI tract of the
consumer
- The exotoxin of Clostridium perfringens is produced in the food
- The exotoxin of Staphylococcus aureus is produced in the GI tract of the consumer
- Except infants, the botulinum toxin is produced in the food
Choose the correct statement!
- Beta-agonists are banned substances in the veterinary
medicine
- Androgens are banned substances in the veterinary
medicine
- Beta-agonists are banned for growth promotion, but can be
used for treatment of animals
- Nitrofurans are banned for growth promotion, but can be
used for treatment of animals
- Beta-agonists are banned for growth promotion, but can be
used for treatment of animals
Which test is positive for Salmonella?
- Lactose fermentation
- Hemolysis
- Antigen-antibody reaction
- Coagulation
- Antigen-antibody reaction
Which European regulation describes the microbiological criteria of foodstuffs ?
- 852/2004 EC
- 2033/2017 EC
- 2073/2005 EC
- 2033/2003 EC
- 2073/2005 EC
Which sugar(s) can be fermented by Salmonella spp.?
- Glucose
- Lactose
- Sucrose
- None of the above
- Glucose
Which of these steps is necessary during the creation of a 10- fold serial dilution ?
- Mixing the tubes with the vortex before pipetting from them
- Changing the pipette tip between each dilution
- All of the above
- None of the above
- All of the above
What happens to the redox potential of the medium during the bacteria’s multiplication ?
- It always increases
- It always decreases
- It usually decreases, but some obligate anaerobes increase it
- It usually increases, but some obligate aerobes decrease it
- It always decreases
Choose the correct statement!
- Endotoxins produced by microorganisms in the food cause food infection
- Endotoxins produced by microorganisms in the food cause food poisoning
- Exotoxins produced by microorganisms in the food cause food infection
- Exotoxins produced by microorganisms in the food cause food poisoning
- Exotoxins produced by microorganisms in the food cause food poisoning
(Endotoxins are not released until the bacteria are killed
by the immune system)
Choose the correct statement !
- Salmonellae are psychrophilic bacteria
- Campylobacter jejuni is a psychrophilic bacterium
- Listeria monocytogenes is a psychrophilic bacterium
- Staphylococcus aureus is a psychrophilic bacterium
- Listeria monocytogenes is a psychrophilic bacterium
Which bacterium should we use for the positive CAMP-test of Listeria monocytogenes ? (several answers)
- Staphylococcus aureus
- Rhodococcus equii
- Listeria ivanovii
- Escherichia coli
- Staphylococcus aureus
What is the lowest pH for the growth of Salmonella enterica?
- 7.8
- 5.8
- 3.8
- 1.8
- 3.8
Which group of microorganisms were proved to be inhibited by sorbic acid at pH 4.5 during our practice?
- Bacteria
- Yeasts
- Moulds
- None of them
- Yeasts
What parameter is affecting the dissociation level of organic acids used for preservation the most?
- Temperature
- Osmotic pressure
- Humidity
- pH
- pH
Which test is negative for Escherichia coli?
- Indole
- Methyl red
- Citrate
- None of the above
- Citrate
What could be a valid key number for the MNP method? - 333320
- 320
- 3.2
- 10-3
- 320
Choose the correct statement!
- The main target organ of aflatoxins is the liver
- The main target organ of aflatoxins is the kidney
- The main target organ of aflatoxins is the cardiac muscle - The main target organ of aflatoxins is the central nervous
system
- The main target organ of aflatoxins is the liver
carcinogenic
Choose the correct statement!
- Paralytic shellfish poison is a biotoxin produced by
bacteria
- Paralytic shellfish poison is a biotoxin produced by
microscopic algae
- Paralytic shellfish poison is a mycotoxin produced by
bacteria
- Paralytic shellfish poison is a mycotoxin produced by
microscopic algae
- Paralytic shellfish poison is a biotoxin produced by
microscopic algae
Choose the correct statement! - Foodborne disease caused by Campylobacter jejuni are
diseases characterised by extraintestinal signs
- Foodborne disease caused by Salmonella enteritidis are
characterised by extraintestinal signs
- Foodborne disease caused by Yersinia enterocolitica are
characterised by extraintestinal signs
- Foodborne disease caused by Listeria monocytogenes are characterised by extraintestinal signs
- Foodborne disease caused by Listeria monocytogenes are characterised by extraintestinal signs
Choose the correct statement!
- The exotoxin produced by Staphylococcus aureus is heat stable
- The botulinum toxin is heat stable
- The diarrhoeic toxin of Bacillus cereus is heat stable
- The exotoxin of Clostridium perfringens is heat stable
????
Which bacterium can be detected with the Baird Parker plate ?
- Salmonella enterica
- Escherichia coli
- Enterococcus faecalis
- Staphylococcus aureus
- Staphylococcus aureus
What is the basis of CAMP test in the Listeria monocytogenes confirmation?
- Agglutination
- Coagulation
- Haemolysis
- pH decrease
- Haemolysis
Which ion makes the color reaction with the protein traces during the Biuret reaction?
- Chrome
- Magnesium
- Iron
- Copper
- Copper
Which one is NOT a chapter of the 2073/2005 EC regulation? - Food safety criteria
- Process hygiene criteria
- Hazard analysis criteria
- Rules for sampling and preparation of test samples
- Hazard analysis criteria
What can we detect with the Limulus-test ?
- Gram + bacterium enzymes
- Lipopolysaccharide of Gram positive bacteria
- Lipopolysaccharide of Gram negative bacteria
- Chilia proteins
- Lipopolysaccharide of Gram negative bacteria
Choose the correct statement!
- Food hygiene is the basic system of requirements and
tools guaranteeing food safety
- Food hygiene is the basic system of requirements and
tools guaranteeing food quality
- Food safety is the basic system of requirements and tools
guaranteeing food hygiene
- Food quality is the basic system of requirements and tools
guaranteeing food hygiene
- Food hygiene is the basic system of requirements and
tools guaranteeing food safety
Choose the correct statement!
- D value is the temperature increase needed for a decrease of the live cell count by one order of magnitude
- D value is the time needed for a decrease of live cell count by one order of magnitude
- Z value is the time needed for a decrease of live cell count by one order of magnitude
- Z value is the temperature reduction needed for a decrease of live cell count by one order of magnitude
- D value is the temperature increase needed for a decrease of the live cell count by one order of magnitude
