6612073
Pregunta 1
Pregunta
Prokaryotic organisms have
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No nuclear envelope
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A nuclear envelope
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Chromosomes
Pregunta 2
Pregunta
Which of these are examples of oral habitats for microorganisms?
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Buccal mucosa
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Dorsal surface of tongue
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Appliances
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Gingival crevice
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Tooth surface
Pregunta 3
Pregunta
Which of these are non-specific defence factors found in saliva?
Respuesta
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Lactoferrin
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Lysozyme
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IgA
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HCO3
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PO4
Pregunta 4
Pregunta
Which of these are specific defence factors found in saliva?
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IgA
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Lysozyme
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Lactoferrin
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Calcineurin
Pregunta 5
Pregunta
What are the most important buffer systems of saliva?
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HCO3
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HPO4
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Na
-
K
Pregunta 6
Pregunta
Lysozyme functions by cleaving the [blank_start]beta[blank_end]-1-4 linkage between N-acetylg[blank_start]lucosamine[blank_end] and N-acetylm[blank_start]uramic[blank_end] acid which is the repeating [blank_start]di[blank_end]saccharide unit of cell wall p[blank_start]eptidoglycan[blank_end]. This means it can lyse many streptococci.
Respuesta
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beta
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lucosamine
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uramic
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di
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eptidoglycan
Pregunta 7
Pregunta
What pH of saliva promotes growth of some cariogenic bacteria?
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Acidic
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Neutral
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Alkaline
Pregunta 8
Pregunta
Which of these are functions of GCF?
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Flushing out microbes
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Buffering
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Provision of defence factors
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Phagocytosis of bacteria by T cells
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Phagocytosis of bacteria by neutrophils
Pregunta 9
Pregunta
What is an example of a defence factor in GCF?
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Interleukin 1 beta
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Interferon alpha
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Bacteriocin like inhibitory substrate
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Gingipains
Pregunta 10
Pregunta
What is the predominant leukocyte in GCF?
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Neutrophils
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B cells
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T cells
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Macrophages
Pregunta 11
Pregunta
What is an example of a synergistic interaction of bacteria?
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Bacteria using metabolic end products as nutrient sources
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The production of BLIS by strep salivarius to inhibit strep pyogenes
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Occupation of niches to prevent colonisation by new species
Pregunta 12
Pregunta
Co-aggregation of the same species of bacteria is known as...
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Homotypic
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Heterotypic
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Transience
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Coexistence
Pregunta 13
Pregunta
What does BLIS stand for?
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Bacteriocin like inhibitory substance
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Bacterial inhibitory substance
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Bacterial lysis substance
Pregunta 14
Pregunta
What is the main prerequisite for host colonisation?
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Adherence to oral surfaces
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Failure of host immunity
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Previous dental caries
Pregunta 15
Pregunta
Which of these substances are extracellular polysaccharides produced by certain bacteria?
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Glucan
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Fructan
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Levan
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Dextran
Pregunta 16
Pregunta
What species of bacteria predominates in fissures?
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Streptococci
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Lactobacilli
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Actinomyces
Pregunta 17
Pregunta
Prevotella, Porphyromonas and Spirochaetes tend to colonise the
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Teeth
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Gingival crevice
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Buccal mucosa
Pregunta 18
Pregunta
Strep and Actinomyces spp. tend to attach to the
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Teeth
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Gingival crevice
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Dorsum of the tongue
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Vestibule
Pregunta 19
Pregunta
Anaerobic bacteria do not tend to appear until adolescence.
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- True
- False
Pregunta 20
Pregunta
Loss of all the teeth (senility) leads to oral microflora similar to..
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Those with appliances
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Children before eruption
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Adults with acute necrotising ulcerative gingivitis
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Those found in the gingival crevice
Pregunta 21
Pregunta
Denture plaque is most similar to...
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Enamel plaque
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Crevicular plaque
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Mucosal plaque
Pregunta 22
Pregunta
Dental plaque contains...
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Dead bacteria
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Living bacteria
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Host compounds derived mainly from Saliva
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Prions
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Metabolic end products of bacteria
Pregunta 23
Pregunta
Organic matrix makes up ___ of plaque
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30%
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40%
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10%
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75%
Pregunta 24
Pregunta
Plaque is the result of mineralisation of calculus
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- True
- False
Pregunta 25
Pregunta
Glucose is a better intracellular store than glycogen for bacteria.
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- True
- False
Pregunta 26
Pregunta
The enzyme(s) involved in extracellular polysaccharide formation is/are...
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Fructosyltransferase
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Glucosyltransferase
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Hexokinase
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Fructokinase
Pregunta 27
Pregunta
Xylitol is fermented but very slowly
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- True
- False
Pregunta 28
Pregunta
Starch is less cariogenic than sucrose
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- True
- False
Pregunta 29
Pregunta
Cooked starch and sucrose is more cariogenic than sucrose alone
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- True
- False
Pregunta 30
Pregunta
____________________ help bacteria to continue to produce acid after dietary sugar is exhausted
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Intracellular polysaccharides
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Extracellular polysaccharides
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Glucosyltransferase and fructokinase
Pregunta 31
Pregunta
The most important acid resulting in caries is...
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Lactic acid
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Acetic acid
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Propionic acid
Pregunta 32
Pregunta
Why can sucrose readily diffuse into plaque?
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Small molecular size
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Lots of energy released upon its breakdown
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Bacterial metabolism is rapid
Pregunta 33
Respuesta
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Invertase
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Glucosyltransferase
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Hexokinase
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Sucrase
Pregunta 34
Respuesta
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Glucosyltransferase
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Fructosyltransferase
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Invertase
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Maltase
Pregunta 35
Respuesta
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Glycogen
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Glucose
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Glucan
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Dextran
Pregunta 36
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Dissolution
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Remineralisation
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Deposition
Pregunta 37
Pregunta
Glucosyltransferase can break down sucrose.
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- True
- False
Pregunta 38
Pregunta
Fructosyltransferase can break down sucrose.
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- True
- False
Pregunta 39
Pregunta
Glucosyltransferase converts sucrose into fructans and glucans.
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- True
- False
Pregunta 40
Respuesta
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Fructosyltransferase
Pregunta 41
Pregunta
Irreversible short range interactions of plaque involve
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Adhesin receptors
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Van Der Waals forces
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Hydrogen bonding
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