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