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Oral Flora and Dental Plaque

Oral Flora and Dental Plaque

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Question 1 of 41

1

Prokaryotic organisms have

Select one of the following:

No nuclear envelope
A nuclear envelope
Chromosomes

Explanation

Question 2 of 41

1

Which of these are examples of oral habitats for microorganisms?

Select one or more of the following:

Buccal mucosa
Dorsal surface of tongue
Appliances
Gingival crevice
Tooth surface

Explanation

Question 3 of 41

1

Which of these are non-specific defence factors found in saliva?

Select one or more of the following:

Lactoferrin
Lysozyme
IgA
HCO3
PO4

Explanation

Question 4 of 41

1

Which of these are specific defence factors found in saliva?

Select one or more of the following:

IgA
Lysozyme
Lactoferrin
Calcineurin

Explanation

Question 5 of 41

1

What are the most important buffer systems of saliva?

Select one or more of the following:

HCO3
HPO4
Na
K

Explanation

Question 6 of 41

1

Fill the blank spaces to complete the text.

Lysozyme functions by cleaving the -1-4 linkage between N-acetylg and N-acetylm acid which is the repeating saccharide unit of cell wall p. This means it can lyse many streptococci.

Explanation

Question 7 of 41

1

What pH of saliva promotes growth of some cariogenic bacteria?

Select one of the following:

Acidic
Neutral
Alkaline

Explanation

Question 8 of 41

1

Which of these are functions of GCF?

Select one or more of the following:

Flushing out microbes
Buffering
Provision of defence factors
Phagocytosis of bacteria by T cells
Phagocytosis of bacteria by neutrophils

Explanation

Question 9 of 41

1

What is an example of a defence factor in GCF?

Select one of the following:

Interleukin 1 beta
Interferon alpha
Bacteriocin like inhibitory substrate
Gingipains

Explanation

Question 10 of 41

1

What is the predominant leukocyte in GCF?

Select one of the following:

Neutrophils
B cells
T cells
Macrophages

Explanation

Question 11 of 41

1

What is an example of a synergistic interaction of bacteria?

Select one of the following:

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

Explanation

Question 12 of 41

1

Co-aggregation of the same species of bacteria is known as...

Select one of the following:

Homotypic
Heterotypic
Transience
Coexistence

Explanation

Question 13 of 41

1

What does BLIS stand for?

Select one of the following:

Bacteriocin like inhibitory substance
Bacterial inhibitory substance
Bacterial lysis substance

Explanation

Question 14 of 41

1

What is the main prerequisite for host colonisation?

Select one of the following:

Adherence to oral surfaces
Failure of host immunity
Previous dental caries

Explanation

Question 15 of 41

1

Which of these substances are extracellular polysaccharides produced by certain bacteria?

Select one or more of the following:

Glucan
Fructan
Levan
Dextran

Explanation

Question 16 of 41

1

What species of bacteria predominates in fissures?

Select one of the following:

Streptococci
Lactobacilli
Actinomyces

Explanation

Question 17 of 41

1

Prevotella, Porphyromonas and Spirochaetes tend to colonise the

Select one of the following:

Teeth
Gingival crevice
Buccal mucosa

Explanation

Question 18 of 41

1

Strep and Actinomyces spp. tend to attach to the

Select one of the following:

Teeth
Gingival crevice
Dorsum of the tongue
Vestibule

Explanation

Question 19 of 41

1

Anaerobic bacteria do not tend to appear until adolescence.

Select one of the following:

True
False

Explanation

Question 20 of 41

1

Loss of all the teeth (senility) leads to oral microflora similar to..

Select one of the following:

Those with appliances
Children before eruption
Adults with acute necrotising ulcerative gingivitis
Those found in the gingival crevice

Explanation

Question 21 of 41

1

Denture plaque is most similar to...

Select one of the following:

Enamel plaque
Crevicular plaque
Mucosal plaque

Explanation

Question 22 of 41

1

Dental plaque contains...

Select one or more of the following:

Dead bacteria
Living bacteria
Host compounds derived mainly from Saliva
Prions
Metabolic end products of bacteria

Explanation

Question 23 of 41

1

Organic matrix makes up ___ of plaque

Select one of the following:

30%
40%
10%
75%

Explanation

Question 24 of 41

1

Plaque is the result of mineralisation of calculus

Select one of the following:

True
False

Explanation

Question 25 of 41

1

Glucose is a better intracellular store than glycogen for bacteria.

Select one of the following:

True
False

Explanation

Question 26 of 41

1

The enzyme(s) involved in extracellular polysaccharide formation is/are...

Select one or more of the following:

Fructosyltransferase
Glucosyltransferase
Hexokinase
Fructokinase

Explanation

Question 27 of 41

1

Xylitol is fermented but very slowly

Select one of the following:

True
False

Explanation

Question 28 of 41

1

Starch is less cariogenic than sucrose

Select one of the following:

True
False

Explanation

Question 29 of 41

1

Cooked starch and sucrose is more cariogenic than sucrose alone

Select one of the following:

True
False

Explanation

Question 30 of 41

1

____________________ help bacteria to continue to produce acid after dietary sugar is exhausted

Select one of the following:

Intracellular polysaccharides
Extracellular polysaccharides
Glucosyltransferase and fructokinase

Explanation

Question 31 of 41

1

The most important acid resulting in caries is...

Select one of the following:

Lactic acid
Acetic acid
Propionic acid

Explanation

Question 32 of 41

1

Why can sucrose readily diffuse into plaque?

Select one of the following:

Small molecular size
Lots of energy released upon its breakdown
Bacterial metabolism is rapid

Explanation

Question 33 of 41

1

Label the green question mark

Select one of the following:

Invertase
Glucosyltransferase
Hexokinase
Sucrase

Explanation

Question 34 of 41

1

Label the red question mark

Select one of the following:

Glucosyltransferase
Fructosyltransferase
Invertase
Maltase

Explanation

Question 35 of 41

1

Label the purple question mark

Select one of the following:

Glycogen
Glucose
Glucan
Dextran

Explanation

Question 36 of 41

1

Label the blue question mark

Select one of the following:

Dissolution
Remineralisation
Deposition

Explanation

Question 37 of 41

1

Glucosyltransferase can break down sucrose.

Select one of the following:

True
False

Explanation

Question 38 of 41

1

Fructosyltransferase can break down sucrose.

Select one of the following:

True
False

Explanation

Question 39 of 41

1

Glucosyltransferase converts sucrose into fructans and glucans.

Select one of the following:

True
False

Explanation

Question 40 of 41

1

Click on the orange point and write the correct answer.

Label the diagram

Explanation

Question 41 of 41

1

Irreversible short range interactions of plaque involve

Select one of the following:

Adhesin receptors
Van Der Waals forces
Hydrogen bonding

Explanation