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0 Exakte Antworten 22 Text Antworten 58 Multiple Choice Antworten
Fenster schliessen

Which of these foods will spoil the fastest?
 

intact foods

foods with a low pH

processed foods

moist foods

Fenster schliessen

Micrococcus luteus is ...

an obligate aerobe, oxidase (+), coccus, tetradarranging, pigmented (carotenoid pigments)

an obligate aerobe, oxidase (+), bacillus, tetradarranging, pigmented (carotenoid pigments)

an obligate anerobe, oxidase (+), coccus, tetradarranging, pigmented (carotenoid pigments)

an obligate aerobe, oxidase (-), coccus, tetradarranging, pigmented (carotenoid pigments)

an obligate anaerobe, oxidase (+), bacillus, tetradarranging, pigmented (carotenoid pigments)

Fenster schliessen

Micrococcaceae 2

part of the normal flora of the mammalian skin

found in water, soil, air, food

weak proteolytic properties - some couse sweet curdling of milk

hygiene microbiological indicators of water, food and technological processes

constant meat microflora: curing (contribution to development of curing colour and flavour in meat products)

Fenster schliessen

Staphylococcus 1

facultative anaerobes, catalase(+), oxidase(-)

facultative anaerobes, catalase(-), oxidase(-)

facultative aerobes, catalase(+), oxidase(-)

facultative anaerobes, catalase(+), oxidase(+)

facultative aerobes, catalase(+), oxidase(-)

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Staphylococcus 2

found on the animal and human skin and mucous membranes, in water, soil, air, food

resistant to antibiotics: plasmid encoded antibiotic resistance and transfer

sensitive to disinfectants

constant meat microflora: curing (contribution to development of curing colour and flavour in meat products)

reduction of nitrates, decomposition of proteins or amino acids

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Staphylococcus aureus ...

is a caogulase(+) pathogen

produces heat-resistant enterotoxin

is obligate aerobe, oxidase (+)

is a coccus, tetradarranging

is pigmented (carotenoid pigments)

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Saprophytic species are used as starter cultures:

S. xylosus

S. carnosus

S. aureus

S. luteus

S. marcescens

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Streptococcus 1

nonmotile, sensitive to antibiotics

nonmotile, catalase (+), oxidative metabolism of sugars to water and CO2, reduce nitrates

catalase and oxidase(-), incapable of reducing nitrate

found on oral mucous membranes; in milk

found on the animal and human skin and mucous membranes, in water, soil, air, food

Fenster schliessen

Streptococcus 2

nonmotile, sensitive to antibiotics

produces heat-resistant enterotoxin

facultative anaerobes, catalase(+), oxidase(-)

phatogenic species cause mastitis & pyoderma of skin and wounds

weak proteolytic properties - some couse sweet curdling of milk

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What is true about these Streptococci?

S. thermophilus is a thermophile Streptococcus

S. bovis is found in ruminant digestive system

S. pyogenes (a betahemolytic streptococci) is a phatogenic species

S. carnosus is found in raw meat

S. xylosus metabolizes xylose

Fenster schliessen

Lactococcus 1

nonmotile, sensitive to antibiotics

partially motile, sensitive to antibiotics

catalase and oxidase(-), incapable of reducing nitrate

catalase and oxidase(+), incapable of reducing nitrate

catalase and oxidase(+), capable of reducing nitrate

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Lactococcus 2

facultative anaerobes, mesophiles, lactic acid homoformentation

facultative aerobes, mesophiles, lactic acid homoformentation

facultative aerobes, thermophiles, lactic acid homoformentation

facultative aerobes, thermophiles, lactic acid heteroformentation

facultative anaerobes, mesophiles, lactic acid heteroformentation

Fenster schliessen

Lactococcus 3

found in milk, on green parts of plants

production of bacteriocins: Nizin

production of bacteriocins: Nitamycin

found in ruminant digestive system

found on the animal and human skin and mucous membranes, in water, soil, air, food

Fenster schliessen

Lactococci used in food production:

L. lactis ssp. lactis

L. lactis ssp. cremoris

L. lactis ssp. cremosa

L. lactis ssp. lacta

L. lacti ssp. lactis

Fenster schliessen

Enterococcus 1

nonmotile, resistant to antibiotics

partially motile, resistant to antibiotics

nonmotile, sensitive to antibiotics

catalase and oxidase(-), incapable of reducing nitrate

catalase and oxidase(+), incapable of reducing nitrate

Fenster schliessen

Enterococcus 2

facultative anaerobes, mesophiles, lactic acid homofermentation

found in the animal and human digestive system

Resistant to high concentrations of NaCl

found in milk, on green parts of plants

facultative anaerobes, mesophiles, lactic acid heterofermentation

Fenster schliessen

Enterococcus 3

thermoduric bacteria which can survive, to varying extents, the pasteurisation process

survive freezing process

do not survive freezing process

psychotroph bacteria which can survive, to varying extents, the pasteurisation process

psychoduric bacteria which can survive, to varying extents, the pasteurisation process

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Enterococcus 4

Enterococci are resistant to preservatives

Enterococci are resistant to antibiotics

Enterococci are resistant to desinfectants

Enterococci exhibit amino acid decarboxylating activity – biogenic amines (histamine)

Enterococci exhibit weak proteolytic properties - some couse sweet curdling of milk

Fenster schliessen

Enterococcus 5

possible transfer of antibiotic resistance genes

not allowed to be used in food production

allowed to be used in feed production

allowed to be used in food production

not allowed to be used in feed production

Fenster schliessen

Leuconostoc 1

nonmotile, sensitive to antibiotics

nonmotile, resistant to antibiotics

catalase and oxidase(-), incapable of reducing nitrate

catalase and oxidase(+), incapable of reducing nitrate

catalase and oxidase(-), capable of reducing nitrate

Fenster schliessen

Leuconostoc 2

facultative anaerobes, mesophiles, lactic acid heteroformentation

facultative aerobes, mesophiles, lactic acid homoformentation

facultative anaerobes, termoophiles, lactic acid heteroformentation

found in milk, on green parts of plants

found in the animal and human digestive system

Fenster schliessen

Leuconostoc 3

used in production of dextran - produced in the glycocalyx covering the cells (synthetic blood plasma substitute, slime defects in food products)

capable of performing citrate fermentation (diacetyl - butter flavor)

cause flavor defect in the brewing industry

amino acid decarboxylating activity – biogenic amines (histamine)

resistant to high concentrations of NaCl

Fenster schliessen

Pediococcus 1

occur in pairs or tetrads, nonmotile, senstitive to antibiotics

occur in triads or tetrads, motile, senstitive to antibiotics

occur in pairs or triads, nonmotile, resistant to antibiotics

catalase and oxidase(-), incapable of reducing nitrate

catalase and oxidase(+), capable of reducing nitrate

Fenster schliessen

Pediococcus 2

facultative anaerobes, mesophiles, lactic acid homoformentation

facultative aerobes, thermophiles, lactic acid homoformentation

found in meat, green parts of plants

found in milk, green parts of plants

obligate anaerobes, mesophiles, lactic acid heteroformentation

Fenster schliessen

Which of these Pediococci are used in starter cultures in the meat industry?

P. acidilactici

P. pentosaceus

P. pentosauce

P. acidilactococci

P. pentose

Fenster schliessen

Lactobacillus 1

short or long rods, sensitive to antibiotics

catalase(-), incapable of reducing nitrate, high nutritional requirements

catalase(+), capable of reducing nitrate, high nutritional requirements

oxidase(+), short or long rods, resistant to antibiotics

catalase and oxidase(+), capable of reducing nitrate, low nutritional requirements

Fenster schliessen

Lactobacillus 2

facultutive anaerobes or microaerophiles, mesophiles and thermophiles

facultutive aerobes or microaerophiles, thermophiles

obligate anaerobes or microaerophiles, mesophiles

found on mucous membranes, digestive system, plant material, milk, meat

found in meat, green parts of plants

Fenster schliessen

Lactobacillus 3

lactic acid homofermentation

lactic acid heterofermentation

may cause spoilage defects – color defects in meat e.g. greening

some probiotic bacteria

starter culture component in meat industry

Fenster schliessen

Lactobacilli exhibit antimicrobial activity through the following metabolites:

lactic acid

acetic acid

H2O2

bacteriocins

butyric acid

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Propionibacterium 1

pleomorphism (X, Y, coccoid), facultative anaerobes, catalase(+), incapable of reducing nitrate

pleomorphism (X, Y, bacilloid), facultative aerobes, catalase(+), incapable of reducing nitrate

pleomorphism (X, Y, bacilloid or coccoid), facultative anaerobes, catalase(-), capable of reducing nitrate

found in rumen of cattle and sheep

found on mucous membranes, digestive system, plan material, milk, meat