Oral Microbiology Test

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1 / 60

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

a. Staphylococci

b. Treponema pallidum

c. Streptococcus pneumonia

d. Porphyromonas spp.

2 / 60

Which genus of bacterium contributes to plaque, caries, gingivitis, and periodontal disease?

a. Escherichia

b. Bacillus.

c. Streptococcus

d. Staphylococcus

3 / 60

What are the predominant plaque bacteria in gingivitis?

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

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

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

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

4 / 60

Bacterial pathogens attach most often by all except which of the following mechanisms?

a. Fimbriae (pili)

b. Spikes

c. Glycocalyx.

d. Adhesins

5 / 60

Which of the following statements on clinical sign of necrotizing ulcerative gingivitis is INEXACTE?

a. Irregular alveolar bone loss around teeth

b. Unpleasant metallic taste

c. Inflamed, red, shiny and bleeding gingivae

d. Loss of supporting tissues (noma).

6 / 60

Which of the following disease most commonly afflicts human?

a. Dentoalveolar abscess

b. Periodontal disease

c. Ludwig’s angina

d. Periodontal abscess.

7 / 60

Mouthwashes used for controlling oral malodor should contain?

a. Xylitol.

b. Antibacterial agent

c. Alcohol

d. Sugar to make them more palatable to consumers

8 / 60

Which of the following statements on acute necrotizing ulcerative gingivitis is INEXACTE?

a. Possibly systemic diseases

b. If untreated, ulcers enlarge and spread to involve marginal

c. Commonly associated with poor and neglected oral hygiene

d. The disease may be inherited (autosomal recessive).

9 / 60

Widely accepted theory of dental caries is 😕

a. Proteolytic chelation theory

b. Acidogenic theory

c. Proteolytic theory

d. Autoimmune theory.

10 / 60

Which of the following procedures can be regarded as optimal for controlling cross infection in a dental clinic?

a. Wearing headgear for all operational procedures

b. Wearing gloves after removal of all hand jewellery.

c. Wearing a single face mask for 3 h

d. Washing the gloves and reusing after visual examination of a patient

11 / 60

The bacteria detected in localized aggressive periodontitis are:?

a. Borrelia vincenti and medium size spirochetes.

b. Fusiformis and Tanerella forsythus.

c. Treponema denticola and fusobacterium nucleatum.

d. A. actinomycetemcomitans, Capnocytophaga spp. and Porphyromonas gingivalis.

12 / 60

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

a. Death due to asphyxiation

b. Respiratory tract infections.

c. pread of infection to masticator

d. Airway obstruction due to edema of glottis

13 / 60

The human body provides a favorable habitat for microorganisms. Which of the following does not contribute to this favorable habitat?

a. Constant source of nourishment

b. Stable temperature

c. Relatively stable pH.

d. Low levels of moisture

14 / 60

Gram staining reflects in bacteria?

a. differences in the bacterial plasmatic membrane

b. presence or absence of nucleus.

c. differences in bacterial metabolism

d. differences in the cell wall structure

15 / 60

In dentoalveolar abscess, the bacteria reach pulp by:?

a. Plaque microorganisms

b. Poor oral hygiene

c. Traumatic exposure during dental treatment

d. Primary herpetic gingivostomatitis.

16 / 60

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

a. Contact with contaminated food

b. Sexual intercourse

c. Placental transfer.

d. Transfusion

17 / 60

The main causative agent of Ludwig angina is:?

a. Treponema pallidum

b. Staphylococci

c. Fusobacteria.

d. Streptococcus pneumonia

18 / 60

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

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

b. Gram-positive cocci predominate in healthy gingival crevice

c. facultative anaerobes predominate in gingivitis.

d. Gram-negative anaerobes predominate in chronic periodontitis

19 / 60

Probiotics exhibit all BUT the following characteristics:?

a. Nontoxic and nonpathogenic to host

b. Remain viable for a long time

c. Mimic antibiotics

d. Have beneficial effect on host.

20 / 60

Which of the following statements on dental caries is INEXACTE?

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

b. Carious lesion is result of demineralization of enamel

c. Commonly associated with malnutrition and possibly systemic diseases

d. Chronic endogenous infection caused by normal oral commensal flora

21 / 60

A facultative anaerobic is:?

a. Ordinarily an anaerobe but can grow with O2

b. Only grow anaerobically

c. Only grow in the presence of O2

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

22 / 60

Which of the following vaccines would you recommend to your new female dental surgery assistant starting work with you?

a. Hepatitis B immunoglobulin

b. Hepatitis C.

c. Hepatitis A

d. Measles–mumps–rubella (MMR)

23 / 60

Turbid dentin in carious tooth is all EXCEPT:?

a. Zone in which collagen is irreversibly denatured

b. Zone that need not be removed before restoration.

c. Zone of bacterial invasion

d. Zone which cannot be remineralised

24 / 60

There are some main routes of infection in oral cavity, which one is inexact?

a. Transferred by hands or objects

b. Transferred through the air on dust particles or water droplets

c. Required by transient flora

d. Transferred by insects bite.

25 / 60

Fusobacterium Nucleatum 😕

a. Non capsulate diplococci

b. Gram-positive, strictly anaerobic

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

d. Isolated from monomicrobial infections

26 / 60

Various viral infections are of relevance to the dental team, including those that cause disease affecting the head neck region. Which one of the following viruses causes cold sores?

a. Paramyxovirus

b. Herpes simplex

c. Herpes zoster

d. Epstein-Barr

27 / 60

Main causative organism of chicken pox is?

a. Fox virus

b. Measles virus

c. Mumps virus

d. Varicella Zoster virus

28 / 60

Toxins or enzymes which are not produced by streptococcus pyogenes?

a. Streptokinase

b. Phosphate

c. Hyaluronides

d. Hemolysin

29 / 60

Which microorganism implicated in pit and fissure caries?

a. Actinimyces viscosus

b. Streptococcus mutans

c. Streptococcus mitis

d. Staphylococcus aureus

30 / 60

Elderly patients sometimes present with a fungal infection of the palate, beneath a denture,referred to as denture stomatitis. Which organism causes this condition?

a. Actinomyces

b. Herpes simplex

c. Staphylococcus aureus

d. Candida albicans

31 / 60

Anaérobies strictes គឺពពួកបាក់តេរីដែលអាចរស់ និងលូតលាស់បានទាល់តែ?

a. មានខ្យល់ O2 ល្មម

b. មានខ្យល់ O2ច្រើន

c. មានខ្យល់ O2 តិច

d. គ្មានខ្យល់ O2 សោះ

32 / 60

ក្នុងការជ្រាបចូលនៃសារធាតុនិងចំណីអាហាររបស់បាក់តេរីករណី forme complex មុននឹងបាក់ តេរីយកទៅប្រើបានត្រូវការរងការបំបែកដោយ Exoenzyme ជាមុនទើបបានជាម៉ូលេគុលតូចៗ ករណីនេះមានម៉ូលលេគុលមួយចំនួនតូចអាចឆ្លងកាត់ membrame cytoplasmique ដូចជា?

a. Co2, O2, acide gras, polyose

b. O2 , H2O , Nacl , acide gras

c. CO2 , O2 , acide gras , Nacl

d. CO2 , O2 , acide gras

33 / 60

បាក់តេរីប្រភេទ themophile អាចរស់នៅក្នុងសីតុណ្ហភាពជាមធ្យមលើសពី?

a. 37 ˚C

b. 40 ˚C

c. 20 ˚C

d. 30 ˚C

34 / 60

សេចក្តីត្រូវការ (Les besoins nutritifs ) របស់បាក់តេរីផ្នែករូបធាតុក្នុងបរិមាណច្រើនមាន?

a. Carbon(C). Hydrogène(H).Azote(N) +O2 . phosphore (P) Fer (Fe)

b. Carbon(C). Hydrogène(H) .Azote (N) .oxygène(O)

c. phosphore (P) Fer (Fe) . Ca . Mg. K

d. Ca . Mg. K

35 / 60

ដើម្បីរស់ បាក់តេរីការចំណីអាហារប៉ុន្មានភាគរយ នៃ Ration totale សំរាប់ការរស់នៅក្នុងធម្មជាតិ?

a. 1/400

b. 1/300

c. 1/600

d. 1/500

36 / 60

បាក់តេរីខ្លះមិនបង្កអោយមានជំងឺ ( non pathogéne ) អាចរស់នៅក្នុងmilieu?

a. milieu acide

b. milieu acide + base

c. milieu base

d. milieu base ក៏បាន acide ក៏បាន

37 / 60

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

a. បាក់តេរី Grams négatif

b. បាក់តេរី Grams positif

c. ពីចលនា (mobilité ) រូបរាង ( forme )

d. បាក់តេរី Grams positif ឬ Grams négatif

38 / 60

virusមានទំហំតូចជាង បាក់តេរីចំនួន ?

a. ៩០០ ដង

b. ៨០០ ដង

c. ២០០០ ដង

d. ១០០០ ដង

39 / 60

បាក់តេរី Doderlein អាចរស់នៅក្នុង milieu?

a. milieu acide

b. milieu alcalin

c. milieu acide + base

d. milieu base

40 / 60

Paroi នៃបាក់តេរី Gram negatif ផ្សំឡើងដោយ?

a. uréine+gelatin

b. gelatin

c. céramique

d. Mucopeptide

41 / 60

Bactérie ដែលមិនអាចបង្កើត Spore មាន?

a. pneumocoque

b. streptocoque

c. All are corrects

d. coli bacille

e. Staphylocoque

42 / 60

មុខងាររបស់ menbrame cytoplasmique ?

a. សារធាតុខ្លះត្រូវ menbrame បង្ខំចេញទៅវិញ

b. សារធាតុខ្លះត្រូវ menbrame អនុញ្ញាតិអោយចេញចូលដូចជាទឹក។

c. All are corrects

d. ជារបាំងមួយសំរាប់អោយសារធាតុជ្រាបចេញ និង ចូលតាមការអនុញ្ញាតរបស់វា

e. សារធាតុខ្លះទៀតអាចជ្រៀបចូលបានដូចស្ករ acide

43 / 60

Protoplaste គឺជាបាក់តេរីដែល?

a. គ្មាន ស្រោម + paroi peptido-glycane et envelope extemne cytoplasmique ជាច្រើន។

b. មានស្រោម + paroi peptide-glycane et enveloppe externe ព័ទ្ធជុំវិញដោយ menbrame cytoplasmique តែពីរគត់ ។

c. មានស្រោម + paroi + enveloppe អត់មាន cytoplasme

d. គ្មានស្រោម + paroi, peptido-glycane et envelope extene ព័ទ្ធជុំវិញដោយ menbrame cytoplasmique តែមួយគត់ ។

44 / 60

បាក់តេរីប្រភេទ cryophile អាចរស់នៅក្នុងរង្វង់សីតុណ្ហភាព?

a. 6 ˚C

b. 10 ˚C

c. 8 ˚C

d. 4 ˚C

45 / 60

Mycoplasme គឺជាពពួកបាក់តេរីដែលគ្មាន?

a. glycocalix + paroi

b. capsule + paroi

c. Paroi

d. ភ្នាសស៊ីតូប្លាស

46 / 60

Paroi bacterie gram négatif មានលក្ខណៈ?

a. ក្រាស់ អាល់កុលអាចជ្រាប ហើយ bactérie ពណ៍ខៀវ

b. ស្តើង អាល់កុលអាចជ្រាប ហើយ bactérie ពណ៍ក្រហម

c. ស្តើង អាល់កុលមិនអាចជ្រាបចូលបាន

d. ស្តើង អាល់កុលអាចជ្រាបហើយ bactérie ពណ៍ខៀវ

47 / 60

ពួកបាក់តេរី pseudomonas អាចរស់នៅក្នុង milieu ?

a. milieu acide + base

b. milieu acide

c. milieu base

d. All are corrects

48 / 60

Antibiotic which is common use to treat anaerobic bacteria 😕

a. Colistin

b. Vancomycin

c. Metronidazole

d. Gentamicin

49 / 60

Microorganisms in oral tissue can cause 😕

a. Local infection

b. Only local infection

c. Systemic infection

d. Both, local and systemic infection

50 / 60

Strategy to control of nutrients in oral biofilm:?

a. Fluoride

b. Antimicrobial agents

c. Inhibition of key microbial enzyme

d. Stimulate base production

51 / 60

A bacterium that is usually found in tongue 😕

a. Streptococcus mitis

b. Streptococcus pneumoniae

c. Staphylococcus epidemidis

d. Clostridium difficile

52 / 60

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

a. Helicobacter

b. Pseudomonas

c. Enterococcus

d. Staphylococcus

53 / 60

On tooth surface, bacteria that participate actively in adhesion of primary colonizers?

a. Enterococcus stains

b. Streptococcus stains

c. Staphylococcus stains

d. Pseudomonas stains

54 / 60

Oral opportunistic infection happens when:?

a. An organism that usually is pathogenic becomes normal flora

b. An organism that usually is nonpathogenic causes disease

c. An organism that usually is nonpathogenic has no opportunity to cause disease

d. An organism that usually is pathogenic causes disease

55 / 60

Analytical techniques for monitoring biofilms by “Direct detection” 😕

a. High Pressure Liquid Chromatography (HPLC)

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

c. Microscopy techniques

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

56 / 60

Steps in order for biofilm formation:?

a. Adhesion, colonization, coadhesion , maturation and detachment

b. Colonization , adhesion, coadhesion , maturation and detachment

c. Maturation and detachment, adhesion, colonization, coadhesion

d. Coadhesion , adhesion, colonization, maturation and detachment

57 / 60

Analytical techniques for monitoring biofilms by “Indirect detection” 😕

a. Detection of proteins by molecular biology technique

b. High Pressure Liquid Chromatography (HPLC)

c. Microscopy techniques

d. Detection of DNA by molecular biology technique

58 / 60

Infection in oral cavity by oral flora, which proposition is inexact?

a. Changes in exposure to antiseptic

b. Administration of antibiotics

c. Changes in salivary flow

d. Changes in the immune system

59 / 60

Strategy to control of biofilm pH in oral biofilm:?

a. Inhibition of key microbial enzyme

b. Generating nutrients

c. Antiflammatory agents

d. Fluoride

60 / 60

Which bacteria that is not presence in buccal mucosa?

a. Streptococcus mutans

b. Treponema palidum

c. Streptococcus mitis

d. Streptococcus anginosus

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និស្សិតអាចប្រាប់មកកាន់ពួកយើងបានដើម្បីកែកំហុស ឬអំពីបញ្ហាដោយអចេតនាណាមួយដែលកើតមានកំឡុងពេលធ្វើតេស្ត