Oral Microbiology Test

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1 / 60

បរិមាណចំណីអាហារសំរាប់សាងសង់និង ដើម្បីថាមពលហៅថា?

a. Ration totale

b. Ration d’entretien and Ration totale

c. Ration d’entretien

d. ration de croissance

2 / 60

មុខងាររបស់ menbrame cytoplasmique ?

a. សារធាតុខ្លះត្រូវ menbrame បង្ខំចេញទៅវិញ

b. សារធាតុខ្លះត្រូវ menbrame អនុញ្ញាតិអោយចេញចូលដូចជាទឹក។

c. សារធាតុខ្លះទៀតអាចជ្រៀបចូលបានដូចស្ករ acide

d. ជារបាំងមួយសំរាប់អោយសារធាតុជ្រាបចេញ និង ចូលតាមការអនុញ្ញាតរបស់វា

e. All are corrects

3 / 60

virusមានរូបរាងមូលដ្ឋានបីបែប?

a. Complex Helical,Bacillus(rods)

b. Helical, Icosahedral, Complex

c. Helical, Icosahedral ,Spirillum (spirals )

d. Icosa,hedral, Complex, Coccus (sphere)

4 / 60

ក្នុងការជ្រាបចូលនៃសារធាតុនិងចំណីអាហាររបស់បាក់តេរីប្រភេទ perméase មាន?

a. Perméase á ions

b. Perméase á ions (K,PO4, SO4) and Perméase á protein , perméase á acide amines

c. Perméase á protein , perméase á acide amines

d. Perméase á sucre , Perméase á glucose

5 / 60

ពពួកបាក់តេរីណាដែលអាចរស់នៅ បានដោយខ្យល់ O2 រី អត់សោះក៏បាន?

a. Eschérichia-coli

b. Entérobactérie

c. gonocoque

d. Salmonella

6 / 60

បាក់តេរីដែលជាសត្រូវរបស់មនុស្សគឺ?

a. Thermophile

b. cryophile

c. Mésophile

d. psychophile

7 / 60

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

a. O2 , H2O , Nacl , acide gras

b. CO2 , O2 , acide gras

c. Co2, O2, acide gras, polyose

d. CO2 , O2 , acide gras , Nacl

8 / 60

បាក់តេរីខ្លះមិនបង្កអោយមានជំងឺ ( non pathogéne ) អាចរស់នៅក្នុងmilieu?

a. milieu acide + base

b. milieu base ក៏បាន acide ក៏បាន

c. milieu acide

d. milieu base

9 / 60

ក្នុងការជ្រាបចូលនៃចំណីអាហាររបស់បាក់តេរី perméase មានប៉ុន្មានប្រភេទ ?

a. 5ប្រភេទ

b. 4ប្រភេទ

c. 6ប្រភេទ

d. 3ប្រភេទ

10 / 60

បាក់តេរីប្រភេទ themophile អាចរស់នៅក្នុងសីតុណ្ហភាពជាមធ្យមលើសពី?

a. 30 ˚C

b. 20 ˚C

c. 40 ˚C

d. 37 ˚C

11 / 60

ភាគច្រើននៃពពួកបាក់តេរីធ្វើការលូតលាស់នៅ pH?

a. pH : 8-9

b. pH : 9-10

c. pH : 7-7.5

d. pH 6-6.5

12 / 60

virusមានទំហំតូចជាង បាក់តេរីចំនួន ?

a. ២០០០ ដង

b. ១០០០ ដង

c. ៩០០ ដង

d. ៨០០ ដង

13 / 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 ។

14 / 60

បាក់តេរី Doderlein អាចរស់នៅក្នុង milieu?

a. milieu acide

b. milieu alcalin

c. milieu acide + base

d. milieu base

15 / 60

Factor that does not influence to dental caries?

a. Size and form of teeth

b. Individual factor

c. Duration and frequency of exposure

d. Substrate for microorganisms

16 / 60

Strategy to control of rendox potential in oral biofilm:?

a. Oxygenating agents

b. Inhibition of key microbial enzyme

c. Fluoride

d. Stimulate base production

17 / 60

Principal Cocci Gram positive bacteria found in oral cavity:?

a. Neisseria

b. Peptostreptococcus

c. Veillonella

d. Moraxella

18 / 60

Which bacteria that is not always presence in saliva:?

a. Streptococcus salivarius

b. Streptococcus agalactiae

c. Streptococcus mitis

d. Streptococcus oralis

19 / 60

Which bacteria that is not presence in buccal mucosa?

a. Streptococcus anginosus

b. Treponema palidum

c. Streptococcus mutans

d. Streptococcus mitis

20 / 60

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

a. Staphylococcus stains

b. Streptococcus stains

c. Pseudomonas stains

d. Enterococcus stains

21 / 60

Among 4 phases of biofilm formation, the phase that is done immediately about 4 hours is:?

a. Phase 2

b. Phase 3

c. Phase 1

d. Phase 4

22 / 60

Antibiotic which is common use to treat anaerobic bacteria 😕

a. Metronidazole

b. Colistin

c. Vancomycin

d. Gentamicin

23 / 60

Microorganisms in oral tissue can cause 😕

a. Only local infection

b. Local infection

c. Both, local and systemic infection

d. Systemic infection

24 / 60

The most common bacterium that is responsible for tonsillitis and pharyngitis is:?

a. Group-B beta hemolytic Streptococcus ( Streptococcus agalactiae)

b. Streptococcus mitis

c. Streptococcus mutans

d. Group-A beta hemolytic Streptococcus ( Streptococcus pyogenses)

25 / 60

Diseases are always found in oral cavity, except 😕

a. Tuberculosis

b. Typhoid fever

c. Syphilis

d. Gonococci

26 / 60

Major bacteria usually cause dental caries:?

a. Mutans Streptococci, Lactobacilli, Clostridium

b. Mutans Streptococci, Lactobacilli, Actinomyces vicosus

c. Mutans Streptococci, Staphylococcus aureus, Actinomyces vicosus

d. Streptococcus pneumoniae, Lactobacilli, Actinomyces vicosus

27 / 60

The organisms most commonly associated with root caries are ?

a. Actinomyces viscosus

b. Fusobacterium Nucleatum

c. Porphyromonas gingivalis

d. Staphylococcus aureus

28 / 60

The virulence of Porphyromonas gingivalis is partly due to?

a. Hyaluronic acid

b. Proteases, haemolysin and collagenase

c. Cytotoxins

d. Adhesins

29 / 60

A patient attends the surgery with bilateral swelling of the parotid salivary glands. Which condition are they suffering from?

a. Mumps

b. A. Measles

c. Rubella

d. Poliomyelitis

30 / 60

Acute necrotizing ulcerative gingivitis (ANUG) or trench mouth is caused by a mixed bacterial infection such as?

a. Fusobacterium nucleatum and Actinomyces viscosus

b. Fusobacterium nucleatum and Streptococcus mutans

c. Fusobacterium nucleatum and Spirochetes

d. Staphylococcus aureus and Streptococcus mutans

31 / 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. Herpes simplex

b. Actinomyces

c. Staphylococcus aureus

d. Candida albicans

32 / 60

Fusobacterium Nucleatum 😕

a. Non capsulate diplococci

b. Isolated from monomicrobial infections

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

d. Gram-positive, strictly anaerobic

33 / 60

Which of the following statements on Prevotella Intermedia are true:?

a. Black pigmented Gram-positive

b. Implicated in dental Caries in association with Aggregatibacter actino- mycetemcomitans.

c. Microaerophilic

d. Implicated in periodontal disease in association with P. gingivalis

34 / 60

Main causative organism of chicken pox is?

a. Fox virus

b. Mumps virus

c. Measles virus

d. Varicella Zoster virus

35 / 60

Epstein-Barr Virus (EBV)?

a. Achieves latency in sensory ganglia

b. Group A infect: skin and mucous membranes

c. Cause of infectious mononucleosis

d. Betaherpesvirus subfamily of herpesviruses

36 / 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. Epstein-Barr

b. Herpes zoster

c. Herpes simplex

d. Paramyxovirus

37 / 60

Which of the following organisms is most likely to be implicated in dental caries?

a. Escherichia coli

b. Streptococcus sorbinus

c. Staphylococcus aureus

d. Staphylococcus epidermidis

38 / 60

Aggressive periodontitis is treated by:?

a. Amoxicillin 500 mg 3 times/day for 2 weeks.

b. Metronidazole 250 mg 3 times/day for 1 weeks

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

d. Penicillin 500 mg 3 times/day for 3 weeks

39 / 60

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

a. Spikes

b. Glycocalyx.

c. Fimbriae (pili)

d. Adhesins

40 / 60

Dentoalveolar abscess is treated by:?

a. Gingivectomy

b. Drainage through the gingival sulcus or by an external incision.

c. Periodontal flap procedure

d. Gingivoplasty

41 / 60

Lysozyme is present in?

a. Urine

b. Saliva.

c. Sweat

d. Cerebro spinal fluid (CSF)

42 / 60

A facultative anaerobic is:?

a. Only grow in the presence of O2

b. Ordinarily an anaerobe but can grow with O2

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

d. Only grow anaerobically

43 / 60

What are the predominant plaque bacteria in periodontitis?

a. Facultative anaerobia cocci (+)

b. Anaerobic rods (-).

c. Facultative anaerobia cocci (-)

d. Anaerobic rods (+)

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

c. Wearing a single face mask for 3 h

d. Wearing gloves after removal of all hand jewellery.

45 / 60

The bacteria detected in localized aggressive periodontitis are:?

a. Borrelia vincenti and medium size spirochetes.

b. Treponema denticola and fusobacterium nucleatum.

c. Fusiformis and Tanerella forsythus.

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

46 / 60

How to manage dentoalveolar abscess?

a. Removing source of infection and prescribing antibiotics

b. Initial local debridement.

c. Reducing cariogenic flora

d. Probiotics replacement of cariogenic bacteria

47 / 60

The organisms which can grow best in the presence of a low concentration of oxygen?

a. Anaerobic.

b. Aerobic

c. Aerophilic

d. Microaerophilic

48 / 60

An example of a nonspecific chemical barrier to infection is…?

a. unbroken skin

b. cilia in the respiratory tract

c. cytotoxic T cells.

d. lysozyme in saliva

49 / 60

The main causative agent of Ludwig’s angina is:?

a. Group A streptococci.

b. Staphylococci

c. Porphyromonas

d. Legionella infection

50 / 60

How to manage acute necrotizing ulcerative gingivitis?

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

b. Initial local debridement by ultrasonic scaling

c. Reducing cariogenic flora

d. Institute surgical drainage.

51 / 60

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

a. Hepatitis C.

b. Hepatitis A

c. Hepatitis B immunoglobulin

d. Measles–mumps–rubella (MMR)

52 / 60

Which of the following statements on aggressive periodontitis is EXACTE?

a. Initiation is onset of puberty

b. 95% of all periodontal diseases.

c. Prevalence and severity decrease with age

d. Most prevalent disease globally

53 / 60

Which of the following statements on dental caries is INEXACTE?

a. Carious lesion is result of demineralization of enamel

b. Commonly associated with malnutrition and possibly systemic diseases

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

d. Chronic endogenous infection caused by normal oral commensal flora

54 / 60

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

a. Loss of supporting tissues (noma).

b. Inflamed, red, shiny and bleeding gingivae

c. Irregular alveolar bone loss around teeth

d. Unpleasant metallic taste

55 / 60

Mouthwashes contain several chemical agents to effectively control oral malodor. Select the agent that does not belong in mouthwashes:?

a. alcohol

b. essential oils

c. Chlorhexidine gluconate

d. Cetylpyridinium.

56 / 60

Which of the following statements on clinical sign of chronic periodontitis is INEXACTE?

a. Irregular alveolar bone loss around teeth

b. Gross gingival inflammation, fibrosis and some shrinkage

c. Tooth mobility and migration

d. Inflamed, red, shiny and bleeding gingivae.

57 / 60

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

a. Electrical impedance

b. Laser fluorescence

c. Organoleptic assessment.

d. Probing

58 / 60

Which of the following statements on periodontal disease is INEXACT?

a. One of major diseases afflicting humankind

b. Disorders of supporting structures of teeth

c. Manage by restoration

d. Can be controlled by using mechanical cleansing techniques.

59 / 60

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

a. Enamel caries

b. Pulpitis.

c. Dentinal caries

d. Dental caries

60 / 60

Virus replicate by which of the following?

a. Within a host cell

b. Reproduction.

c. Cell division

d. Extracellular

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និស្សិតអាចប្រាប់មកកាន់ពួកយើងបានដើម្បីកែកំហុស ឬអំពីបញ្ហាដោយអចេតនាណាមួយដែលកើតមានកំឡុងពេលធ្វើតេស្ត