Oral Microbiology Test

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1 / 60

Dental caries, which answer is incorrect?

a. Multifunctional microbial disease

b. Increased of the organic substance of the tooth

c. Characterized by demineralization of the inorganic portion

d. Calcified tissues of the teeth

2 / 60

Principal Cocci Gram negative bacteria found in oral cavity:?

a. Gemella

b. Enterococcus

c. Streptococcus

d. Veillonella

3 / 60

Principal Cocci Gram positive bacteria found in oral cavity:?

a. Veillonella

b. Moraxella

c. Neisseria

d. Peptostreptococcus

4 / 60

Microorganisms in oral tissue can cause 😕

a. Systemic infection

b. Both, local and systemic infection

c. Local infection

d. Only local infection

5 / 60

Pathway in order of pathogenesis of oral infection:?

a. Entry of bacteria into soft tissue wall or trauma to the orifice – Formation of infiltrate- Destruction of connective tissues- Pus formation- Decrease tissue resistance and increase number of bacteria with virulence

b. Pus formation- Entry of bacteria into soft tissue wall or trauma to the orifice – Formation of infiltrate- Destruction of connective tissues- Decrease tissue resistance and increase number of bacteria with virulence

c. Decrease tissue resistance and increase number of bacteria with virulence- Entry of bacteria into soft tissue wall or trauma to the orifice – Formation of infiltrate- Destruction of connective tissues- Pus formation

d. Entry of bacteria into soft tissue wall or trauma to the orifice – Pus formation- Formation of infiltrate – Destruction of connective tissues – Decrease tissue resistance and increase number of bacteria with virulence

6 / 60

A bacterium that spread from lung infection and cause oral lesions with clinical sign include fever, chills, fatigue and malaise, weight loss, and persistent cough 😕

a. Mycobacterium tuberculosis

b. Klebsiella pneumoniae

c. Streptococcus pneumoniae

d. Pseudomonas aeruginosa

7 / 60

Major bacteria cause aggressive periodontitis?

a. Eikenella corrodens, Capnocytophaga sputigena, Actinobaccilus actinomycetemcomitans, Prevotella intermedia

b. Capnocytophaga sputigena, Fusobacterium nucleatum, Porphyromonas endodontalis, Prevotella tannerae

c. Actinobaccilus actinomycetemcomitans, Fusobacterium nucleatum, Porphyromonas endodontalis, Prevotella tannerae

d. Prevotella intermedia, Fusobacterium nucleatum, Porphyromonas endodontalis, Prevotella tannerae

8 / 60

Factor that does not influence to dental caries?

a. Individual factor

b. Size and form of teeth

c. Substrate for microorganisms

d. Duration and frequency of exposure

9 / 60

Infections of the mucosa are more usually associated with transient oral bacteria, which one is incorrect?

a. Helicobacter

b. Staphylococcus

c. Pseudomonas

d. Enterococcus

10 / 60

In dental caries, the pathogenic factor is 😕

a. Good oral hygiene

b. Acid producing bacteria

c. Saliva flow and components

d. Remineralization ( fluoride, Calcium, Phosphate)

11 / 60

Strategy to control of biofilm pH in oral biofilm:?

a. Generating nutrients

b. Inhibition of key microbial enzyme

c. Fluoride

d. Antiflammatory agents

12 / 60

Specificity of Anaerobic bacteria, except:?

a. Black pigmentation on culture

b. Grow on anaerobic media culture

c. Foul odor when opening anaerobic jar or bag

d. Incubation culture in 1-2 days

13 / 60

Analytical techniques for monitoring biofilms by “Direct detection” 😕

a. Gas Chromatography – Mass Spectrometry (GC-MS)

b. High Pressure Liquid Chromatography (HPLC)

c. Inductively Coupled Plasma Mass Spectrometry (ICP-MS)

d. Microscopy techniques

14 / 60

A facultative anaerobic is:?

a. Ordinarily an aerobe but can grow in absence of O2.

b. Only grow in the presence of O2

c. Ordinarily an anaerobe but can grow with O2

d. Only grow anaerobically

15 / 60

Which of the following statements on dental caries is INEXACTE?

a. Chronic endogenous infection caused by normal oral commensal flora

b. Destruction of tissues of tooth by bacterial fermentation of dietary carbohydrates.

c. Commonly associated with malnutrition and possibly systemic diseases

d. Carious lesion is result of demineralization of enamel

16 / 60

The peak incidence of juvenile periodontitis in children occurs at ages:?

a. 1-3 years

b. 10-13 years.

c. 5-7 years

d. Birth-6 months

17 / 60

Which of the following statements on streptococci are not true?

a. Can cause caries in the absence of sucrose

b. Can be primarily differentiated by their hemolytic reactions on blood agar

c. Some are Gram-positive and anaerobic

d. mutans group streptococci cause caries

18 / 60

How to manage dental caries?

a. Eliminate primary source of infection

b. Initial local debridement with ultrasonic scaling

c. Institute surgical drainage.

d. Minimal cavity preparation techniques

19 / 60

Which of the following statements on prevention of dental caries is INEXACTE?

a. Plaque-free by routine oral hygiene measures.

b. Probiotics replacement of cariogenic bacteria

c. Stopping or reducing between-meal consumption of carbohydrates

d. Increasing cariogenic flora

20 / 60

Widely accepted theory of dental caries is 😕

a. Autoimmune theory.

b. Acidogenic theory

c. Proteolytic chelation theory

d. Proteolytic theory

21 / 60

Demineralization of inorganic portion and destruction of organic of tooth is known as:?

a. Pulpitis.

b. Enamel caries

c. Dental caries

d. Dentinal caries

22 / 60

The main difference in true bacteria and mycoplasma is that it does not posses:?

a. A capsule.

b. ATP synthesis

c. Flagella

d. Cell wall

23 / 60

Which of the following statements on the natural history of periodontal disease is INEXACT?

a. facultative anaerobes predominate in gingivitis.

b. the proportion of Gram positive rods decreases to nearly 5% in chronic marginal gingivitis

c. Gram-positive cocci predominate in healthy gingival crevice

d. Gram-negative anaerobes predominate in chronic periodontitis

24 / 60

In dentoalveolar abscess, the bacteria reach pulp by:?

a. Plaque microorganisms

b. Poor oral hygiene

c. Primary herpetic gingivostomatitis.

d. Traumatic exposure during dental treatment

25 / 60

What are the predominant plaque bacteria in gingivitis?

a. Anaerobic cocci (-) and Facultative anaerobia rods (-).

b. Facultative anaerobia cocci (+) and Anaerobic rods (-)

c. Anaerobic cocci (+) and Facultative anaerobia cocci rods (+)

d. Facultative anaerobia cocci (-) and Anaerobic rods (-)

26 / 60

Following can be used for cultivation of viruses EXCEPT:?

a. Cell cultures

b. Diploid cell line

c. Blood agar.

d. Primary cell

27 / 60

Initiation of dental caries depends upon:?

a. availability of carbohydrate food

b. formation of large amount of acid

c. Localisation of acid over tooth surface.

d. viscosity of saliva

28 / 60

Turbid dentin in carious tooth is all EXCEPT:?

a. Zone which cannot be remineralised

b. Zone of bacterial invasion

c. Zone that need not be removed before restoration.

d. Zone in which collagen is irreversibly denatured

29 / 60

How to manage acute necrotizing ulcerative gingivitis?

a. Initial local debridement by ultrasonic scaling

b. Tetracycline 250 mg 3 times/day for 4 weeks

c. Institute surgical drainage.

d. Reducing cariogenic flora

30 / 60

Which of the following is associated with dental caries?

a. Staphylococcus aureus.

b. Lactococcus lactis

c. Streptococcus mutans

d. Streptococcus pneumonia

31 / 60

Which of the following statements on diagnosis of dental caries is INEXACTE?

a. Organoleptic assessment.

b. Electrical impedance

c. Laser fluorescence

d. Probing

32 / 60

Communicable diseases can spread by several methods. Which is not an example of the direct transmission mode of disease spread?

a. Placental transfer.

b. Contact with contaminated food

c. Transfusion

d. Sexual intercourse

33 / 60

For a bacterium to be seriously considered in the etiology of dental caries, it must 😕

a. exist regularly in the dental plaque

b. produce extracellular proteolytic enzyme

c. be lethal for animals

d. produce intracellular dextrans.

34 / 60

Which of the following statements on Ludwig’s angina is INEXACTE?

a. it needs to be treated with high-dose, parenteral metronidazole and penicillin

b. the majority of cases are due to submandibular sialadenitis

c. it may warrant an urgent tracheostomy

d. little amount of pus is yielded on surgical drainage.

35 / 60

Which of the following statements on clinical sign of dental caries is INEXACTE?

a. Chalkywhite lesion

b. Roughened and cavitation

c. White-spot lesion.

d. Pseudomembrane (slough)

36 / 60

Members of the genus Lactobacillus are normal microflora of the?

a. Hair

b. Skin

c. Nasopharynx.

d. Mouth

37 / 60

Microorganisms that are frequently implicated in the pathogenesis of periodontal abscess include:?

a. Treponema pallidum

b. Streptococcus pneumonia

c. Staphylococci

d. Porphyromonas spp.

38 / 60

The mutans group of streptococci are key cariogenic pathogens. Which of the following belongs to the mutans group?

a. Streptococcus mutans

b. Streptococcus saprophyticus

c. Streptococcus pneumonia.

d. Streptococcus pyogenes

39 / 60

Which of the following bacteria that is predominant in healthy condition?

a. Actinomyces viscsus

b. Streptococcus milleri

c. Streptococcus sanguinis

d. Actinomyces israelii.

40 / 60

What are the predominant plaque bacteria in healthy condition?

a. Facultative anaerobia cocci (-) and rods (-)

b. Anaerobic cocci (+) and rods (+)

c. Facultative anaerobia cocci (+) and rods (+)

d. Anaerobic cocci (-) and rods (-).

41 / 60

យើងប្រើ Microscope optique ពិនិត្យក្រោយដាក់ព៌ណ ៖ អាចពិនិត្យយ៉ាងច្បាស់លាស់ពីរូបរាង និង ចំណុចសំខាន់ៗ ។ អាចដឹងពីរចនាសម្ព័ន្ធ អាចដឹងពី?

a. ពីចលនា (mobilité ) រូបរាង ( forme )

b. បាក់តេរី Grams négatif

c. បាក់តេរី Grams positif ឬ Grams négatif

d. បាក់តេរី Grams positif

42 / 60

បាក់តេរីខ្លះមិនបង្កអោយមានជំងឺ ( non pathogéne ) អាចរស់នៅក្នុងmilieu?

a. milieu base

b. milieu base ក៏បាន acide ក៏បាន

c. milieu acide

d. milieu acide + base

43 / 60

មុខងាររបស់ menbrame cytoplasmique ?

a. សារធាតុខ្លះទៀតអាចជ្រៀបចូលបានដូចស្ករ acide

b. ជារបាំងមួយសំរាប់អោយសារធាតុជ្រាបចេញ និង ចូលតាមការអនុញ្ញាតរបស់វា

c. សារធាតុខ្លះត្រូវ menbrame អនុញ្ញាតិអោយចេញចូលដូចជាទឹក។

d. សារធាតុខ្លះត្រូវ menbrame បង្ខំចេញទៅវិញ

e. All are corrects

44 / 60

បាក់តេរីដែលជាសត្រូវរបស់មនុស្សគឺ?

a. Thermophile

b. psychophile

c. cryophile

d. Mésophile

45 / 60

ដើម្បីរស់ បាក់តេរីការចំណីអាហារប៉ុន្មានភាគរយ នៃ Ration totale សំរាប់ការរស់នៅក្នុងធម្មជាតិ?

a. 1/600

b. 1/300

c. 1/400

d. 1/500

46 / 60

Mycoplasme គឺជាពពួកបាក់តេរីដែលគ្មាន?

a. glycocalix + paroi

b. Paroi

c. capsule + paroi

d. ភ្នាសស៊ីតូប្លាស

47 / 60

គេប្រើ Microscope électronique តែក្នុងការស្រាវជ្រាវ ។ គេអាចមើលឃើញ នូវរចនាសម្ព័ន្ធ និង ចំណុចដ៏តូចៗ ។ ពិសេសគេ ពិនិត្យ 😕

a. ដោយការកាត់- ពុះខ្លួនបាក់តេរី

b. ពីចលនា (mobilité ) រូបរាង ( forme )

c. បាក់តេរី Grams positif ឬ Grams négatif

d. បាក់តេរី Grams positif

48 / 60

បាក់តេរីប្រភេទ themophile អាចរស់នៅក្នុងសីតុណ្ហភាពជាមធ្យមលើសពី?

a. 30 ˚C

b. 40 ˚C

c. 37 ˚C

d. 20 ˚C

49 / 60

Paroi នៃបាក់តេរី Gram. Positif ផ្សំដោយ?

a. gelatin

b. Céramique and Peptido-glycane ត្រឹមត្រូវ

c. Céramique

d. Peptido-glycane

50 / 60

Paroi នៃបាក់តេរី Gram negatif ផ្សំឡើងដោយ?

a. uréine+gelatin

b. céramique

c. gelatin

d. Mucopeptide

51 / 60

ពួកបាក់តេរី pseudomonas អាចរស់នៅក្នុង milieu ?

a. milieu base

b. milieu acide

c. All are corrects

d. milieu acide + base

52 / 60

សារធាតុណាខ្លះដែលប្រឆាំង និងការរីកលូតលាស់របស់បាក់តេរី?

a. សារធាតុនៃ ពួក Antiseptique ខ្លាំង

b. សារធាតុនៃ ពួក antibiotique,នៃ ពពួក Antiseptique ខ្លាំង ,ខ្សោយ and សារធាតុនៃ ពួក Antiseptique ខ្សោយ

c. សារធាតុនៃ ពួក Antiseptique ខ្សោយ

d. សារធាតុនៃ ពពួក Antiseptique

53 / 60

ពពួកបាក់តេរីដែលគ្មាន peptide-glycane តែមាន enveloppe externe និងភ្នាសcytoplasmique ហៅថា ?

a. Sphéroplaste

b. Mésophile

c. Mycoplasme

d. Protoplastes

54 / 60

Fusobacterium Nucleatum 😕

a. Produce proinflammatory cytokines and up-regulating the inflammatory response

b. Gram-positive, strictly anaerobic

c. Isolated from monomicrobial infections

d. Non capsulate diplococci

55 / 60

Porphyromonas gingivalis:?

a. Are Gram-positive pleomorphic rods

b. Are aggressive periodontal pathogens

c. Are isolated from many extra oral sites

d. Are non-capsulated

56 / 60

Several infections occur in the oral cavity that are of relevance to the dental team. Which of the following infections does virus cause?

a. Acute necrotizing ulcerative gingivitis

b. Herpetic stomatitis

c. Pericoronitis

d. Lateral periodontal abcess

57 / 60

Cryptococcosis?

a. Is a localized inflammation around and under the nails

b. Is an infection caused by Cryptococcus neoformans

c. Is associated with dog lovers

d. Can cause cardiac abnormalities

58 / 60

The organisms most commonly associated with root caries are ?

a. Porphyromonas gingivalis

b. Fusobacterium Nucleatum

c. Actinomyces viscosus

d. Staphylococcus aureus

59 / 60

Toxins or enzymes which are not produced by streptococcus pyogenes?

a. Streptokinase

b. Hemolysin

c. Phosphate

d. Hyaluronides

60 / 60

During AIDS, HIV infects?

a. B Lymphocytes

b. CD3 lymphocytes

c. CD2 lymphocytes

d. CD4 lymphocytes

Your score is

The average score is 86%

Any comments?

Any problems/errors or mistakes found while testing, please let us know for modification!

និស្សិតអាចប្រាប់មកកាន់ពួកយើងបានដើម្បីកែកំហុស ឬអំពីបញ្ហាដោយអចេតនាណាមួយដែលកើតមានកំឡុងពេលធ្វើតេស្ត