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Oral Flora and Dental Plaque

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0 9
Quiz by 0 9, updated more than 1 year ago
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Created by 0 9 about 8 years ago
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Resource summary

Question 1

Question
Prokaryotic organisms have
Answer
  • No nuclear envelope
  • A nuclear envelope
  • Chromosomes

Question 2

Question
Which of these are examples of oral habitats for microorganisms?
Answer
  • Buccal mucosa
  • Dorsal surface of tongue
  • Appliances
  • Gingival crevice
  • Tooth surface

Question 3

Question
Which of these are non-specific defence factors found in saliva?
Answer
  • Lactoferrin
  • Lysozyme
  • IgA
  • HCO3
  • PO4

Question 4

Question
Which of these are specific defence factors found in saliva?
Answer
  • IgA
  • Lysozyme
  • Lactoferrin
  • Calcineurin

Question 5

Question
What are the most important buffer systems of saliva?
Answer
  • HCO3
  • HPO4
  • Na
  • K

Question 6

Question
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.
Answer
  • beta
  • lucosamine
  • uramic
  • di
  • eptidoglycan

Question 7

Question
What pH of saliva promotes growth of some cariogenic bacteria?
Answer
  • Acidic
  • Neutral
  • Alkaline

Question 8

Question
Which of these are functions of GCF?
Answer
  • Flushing out microbes
  • Buffering
  • Provision of defence factors
  • Phagocytosis of bacteria by T cells
  • Phagocytosis of bacteria by neutrophils

Question 9

Question
What is an example of a defence factor in GCF?
Answer
  • Interleukin 1 beta
  • Interferon alpha
  • Bacteriocin like inhibitory substrate
  • Gingipains

Question 10

Question
What is the predominant leukocyte in GCF?
Answer
  • Neutrophils
  • B cells
  • T cells
  • Macrophages

Question 11

Question
What is an example of a synergistic interaction of bacteria?
Answer
  • 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

Question 12

Question
Co-aggregation of the same species of bacteria is known as...
Answer
  • Homotypic
  • Heterotypic
  • Transience
  • Coexistence

Question 13

Question
What does BLIS stand for?
Answer
  • Bacteriocin like inhibitory substance
  • Bacterial inhibitory substance
  • Bacterial lysis substance

Question 14

Question
What is the main prerequisite for host colonisation?
Answer
  • Adherence to oral surfaces
  • Failure of host immunity
  • Previous dental caries

Question 15

Question
Which of these substances are extracellular polysaccharides produced by certain bacteria?
Answer
  • Glucan
  • Fructan
  • Levan
  • Dextran

Question 16

Question
What species of bacteria predominates in fissures?
Answer
  • Streptococci
  • Lactobacilli
  • Actinomyces

Question 17

Question
Prevotella, Porphyromonas and Spirochaetes tend to colonise the
Answer
  • Teeth
  • Gingival crevice
  • Buccal mucosa

Question 18

Question
Strep and Actinomyces spp. tend to attach to the
Answer
  • Teeth
  • Gingival crevice
  • Dorsum of the tongue
  • Vestibule

Question 19

Question
Anaerobic bacteria do not tend to appear until adolescence.
Answer
  • True
  • False

Question 20

Question
Loss of all the teeth (senility) leads to oral microflora similar to..
Answer
  • Those with appliances
  • Children before eruption
  • Adults with acute necrotising ulcerative gingivitis
  • Those found in the gingival crevice

Question 21

Question
Denture plaque is most similar to...
Answer
  • Enamel plaque
  • Crevicular plaque
  • Mucosal plaque

Question 22

Question
Dental plaque contains...
Answer
  • Dead bacteria
  • Living bacteria
  • Host compounds derived mainly from Saliva
  • Prions
  • Metabolic end products of bacteria

Question 23

Question
Organic matrix makes up ___ of plaque
Answer
  • 30%
  • 40%
  • 10%
  • 75%

Question 24

Question
Plaque is the result of mineralisation of calculus
Answer
  • True
  • False

Question 25

Question
Glucose is a better intracellular store than glycogen for bacteria.
Answer
  • True
  • False

Question 26

Question
The enzyme(s) involved in extracellular polysaccharide formation is/are...
Answer
  • Fructosyltransferase
  • Glucosyltransferase
  • Hexokinase
  • Fructokinase

Question 27

Question
Xylitol is fermented but very slowly
Answer
  • True
  • False

Question 28

Question
Starch is less cariogenic than sucrose
Answer
  • True
  • False

Question 29

Question
Cooked starch and sucrose is more cariogenic than sucrose alone
Answer
  • True
  • False

Question 30

Question
____________________ help bacteria to continue to produce acid after dietary sugar is exhausted
Answer
  • Intracellular polysaccharides
  • Extracellular polysaccharides
  • Glucosyltransferase and fructokinase

Question 31

Question
The most important acid resulting in caries is...
Answer
  • Lactic acid
  • Acetic acid
  • Propionic acid

Question 32

Question
Why can sucrose readily diffuse into plaque?
Answer
  • Small molecular size
  • Lots of energy released upon its breakdown
  • Bacterial metabolism is rapid

Question 33

Question
Label the green question mark
Image:
bc7ae282-894a-4ade-956a-5d80bd472715 (image/png)
Answer
  • Invertase
  • Glucosyltransferase
  • Hexokinase
  • Sucrase

Question 34

Question
Label the red question mark
Image:
3e9f54cc-e92a-4605-a79b-51a7f01f21b2 (image/png)
Answer
  • Glucosyltransferase
  • Fructosyltransferase
  • Invertase
  • Maltase

Question 35

Question
Label the purple question mark
Image:
efb73b29-7d62-4a48-9ff7-3a6e52f4a4f1 (image/png)
Answer
  • Glycogen
  • Glucose
  • Glucan
  • Dextran

Question 36

Question
Label the blue question mark
Image:
731d57e0-8c21-482f-9aa4-c7c65e95467c (image/png)
Answer
  • Dissolution
  • Remineralisation
  • Deposition

Question 37

Question
Glucosyltransferase can break down sucrose.
Answer
  • True
  • False

Question 38

Question
Fructosyltransferase can break down sucrose.
Answer
  • True
  • False

Question 39

Question
Glucosyltransferase converts sucrose into fructans and glucans.
Answer
  • True
  • False

Question 40

Question
Label the diagram
Image:
88bd7813-036c-4aa2-9c90-eeb6b033b564 (image/png)
Answer
  • Fructosyltransferase

Question 41

Question
Irreversible short range interactions of plaque involve
Answer
  • Adhesin receptors
  • Van Der Waals forces
  • Hydrogen bonding
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