Oral Microbiology Test

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1 / 60

Following can be used for cultivation of viruses EXCEPT:?

a. Primary cell

b. Blood agar.

c. Diploid cell line

d. Cell cultures

2 / 60

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

a. Treponema pallidum

b. Streptococcus pneumonia

c. Staphylococci

d. Porphyromonas spp.

3 / 60

Caries, all are true except:?

a. Pit and fisssure caries can be prevented by using pit and fissure sealants

b. Fluorides help in reducing caries incidence.

c. Lactobacillus is the main causative organism in plaque

d. Smooth surface caries occur due to streptococcus mutans

4 / 60

Probiotics exhibit all BUT the following characteristics:?

a. Mimic antibiotics

b. Remain viable for a long time

c. Have beneficial effect on host.

d. Nontoxic and nonpathogenic to host

5 / 60

Main predisposing factors of acute necrotizing ulcerative gingivitis is:?

a. Severe malnutrition

b. Host factors

c. Dental caries

d. Intake of fermentable carbohydrates.

6 / 60

A facultative anaerobic is:?

a. Ordinarily an anaerobe but can grow with O2

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

c. Only grow in the presence of O2

d. Only grow anaerobically

7 / 60

Microorganism that can grow in the presence as well as in the absence of molecular oxygen is?

a. facultatively anaerobic.

b. obligatory anaerobic

c. microaerobically

d. obligatory aerobic

8 / 60

Which of the following statements on dentoalveolar abscess is true?

a. it is often precipitated by bacteria from the systemic route (anachoresis)

b. it is frequently implicated as a cause of brain abscess

c. it often resolves without antibiotics after adequate drainage.

d. it is a infection of sublingual and submandibular spaces

9 / 60

In dentoalveolar abscess, the bacteria reach pulp by:?

a. Poor oral hygiene

b. Primary herpetic gingivostomatitis.

c. Plaque microorganisms

d. Traumatic exposure during dental treatment

10 / 60

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

a. Wearing gloves after removal of all hand jewellery.

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

c. Wearing a single face mask for 3 h

d. Wearing headgear for all operational procedures

11 / 60

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

a. Low levels of moisture

b. Stable temperature

c. Relatively stable pH.

d. Constant source of nourishment

12 / 60

Virus replicate by which of the following?

a. Reproduction.

b. Within a host cell

c. Extracellular

d. Cell division

13 / 60

Gram staining reflects in bacteria?

a. differences in the bacterial plasmatic membrane

b. differences in bacterial metabolism

c. differences in the cell wall structure

d. presence or absence of nucleus.

14 / 60

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

a. 1-3 years

b. Birth-6 months

c. 5-7 years

d. 10-13 years.

15 / 60

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

a. Glycocalyx.

b. Fimbriae (pili)

c. Adhesins

d. Spikes

16 / 60

What are the predominant plaque bacteria in healthy condition?

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

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

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

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

17 / 60

Which is not true about Ludwig angina?

a. Maintain fluid balance.

b. Involves submandibular space

c. Caused by an acute or chronic destructive process in periodontium

d. May need emergency tracheostomy

18 / 60

The primary cause of periodontal diseases is?

a. Restoration.

b. Dental Plaque

c. Malocclusion

d. Calculus

19 / 60

In dental caries, the protective factor is 😕

a. Acid producing bacteria

b. Frequent eating / drinking of fermentable carbohydrates

c. Poor oral hygiene

d. Antibacterials ( fluorides, Chlorhexidine, Xylitol)

20 / 60

A bacterium that never found in tooth surface:?

a. Streptococcus mutans

b. Streptococcus anginosus

c. Streptococcus pneumoniae

d. Streptococcus mitis

21 / 60

Analytical techniques for monitoring biofilms by “Direct detection” 😕

a. Microscopy techniques

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

c. High Pressure Liquid Chromatography (HPLC)

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

22 / 60

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

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

b. Streptococcus mutans

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

d. Streptococcus mitis

23 / 60

Which bacteria that is not always presence in saliva:?

a. Streptococcus mitis

b. Streptococcus oralis

c. Streptococcus agalactiae

d. Streptococcus salivarius

24 / 60

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

a. Changes in the immune system

b. Changes in exposure to antiseptic

c. Administration of antibiotics

d. Changes in salivary flow

25 / 60

Strategy to control of biofilm pH in oral biofilm:?

a. Antiflammatory agents

b. Inhibition of key microbial enzyme

c. Generating nutrients

d. Fluoride

26 / 60

Microorganisms in oral tissue can cause 😕

a. Local infection

b. Both, local and systemic infection

c. Only local infection

d. Systemic infection

27 / 60

The comment bacterium causes dental caries:?

a. Mutans Streptococci

b. Staphylococcus aureus

c. E.coli

d. Pseudomonas aeruginosa

28 / 60

Major bacteria usually cause dental caries:?

a. Mutans Streptococci, Staphylococcus aureus, Actinomyces vicosus

b. Mutans Streptococci, Lactobacilli, Clostridium

c. Streptococcus pneumoniae, Lactobacilli, Actinomyces vicosus

d. Mutans Streptococci, Lactobacilli, Actinomyces vicosus

29 / 60

Bacteria usually cause Pericoronitis?

a. Fusiform bacillus, Eikenella corrodens, Alpha-hemolytic Streptococci and Capnocytophaga sputigena

b. Fusiform bacillus , Provetella, Eikenella corrodens and Capnocytophaga sputigen

c. Borrelia vincentii, Bacterioides, Provetella and Eikenella corrodens

d. Alpha-hemolytic Streptococci, Provetella, Bacterioides and Capnocytophaga

30 / 60

Major bacteria cause chronic periodontitis:?

a. Fusobacterium nucleatum, Porphyromonas endodontalis, Prevotella tannerae, Streptococcus anginosus

b. Fusobacterium nucleatum, Porphyromonas endodontalis, Prevotella tannerae, Pseudomonas aeruginosa

c. Fusobacterium nucleatum, Porphyromonas endodontalis, Prevotella tannerae,Stphylococcus aureus

d. Fusobacterium nucleatum, Porphyromonas endodontalis, Prevotella tannerae, E.coli

31 / 60

Major bacteria cause periodontitis 😕

a. Fusobacterium nucleatum, Petostreptococcus micros, Streptococci, Borrela vincenti

b. Fusobacterium nucleatum, Petostreptococcus micros, Enterococcus, Borrela vincenti

c. Fusobacterium nucleatum, E.coli, Streptococci, Borrela vincenti

d. Fusobacterium nucleatum, Petostreptococcus micros, Streptococci, Pneumococcus

32 / 60

Strategy to control of rendox potential in oral biofilm:?

a. Stimulate base production

b. Inhibition of key microbial enzyme

c. Fluoride

d. Oxygenating agents

33 / 60

ពពួកបាក់តេរីដែលគ្មាន peptide-glycane តែមាន enveloppe externe និងភ្នាសcytoplasmique ហៅថា ?

a. Mésophile

b. Sphéroplaste

c. Protoplastes

d. Mycoplasme

34 / 60

គេអាចសិក្សាដឹងពីរូបរាងបាក់តេរីរាងមូល ទ្រវែង និង រាងអង្កាញ់ៗ ដោយសារ?

a. noyau នៃបាក់តេរី

b. Paroi នៃបាក់តេរី

c. Capsule នៃបាក់តេរី

d. glycocalix នៃបាក់តេរី

35 / 60

បាក់តេរីប្រភេទ Mésophile អាចរស់នៅក្នុងសីតុណ្ហភាព?

a. 10-20 ˚C

b. 40-50 ˚C

c. 20-40 ˚C

d. 10-15 ˚C

36 / 60

សេចក្តីត្រូវការ (Les besoins nutritifs ) របស់បាក់តេរីផ្នែករូបធាតុក្នុងបរិមាណច្រើនមាន?

a. Ca . Mg. K

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

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

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

37 / 60

មុខងាររបស់ menbrame cytoplasmique ?

a. សារធាតុខ្លះទៀតអាចជ្រៀបចូលបានដូចស្ករ acide

b. សារធាតុខ្លះត្រូវ menbrame អនុញ្ញាតិអោយចេញចូលដូចជាទឹក។

c. All are corrects

d. ជារបាំងមួយសំរាប់អោយសារធាតុជ្រាបចេញ និង ចូលតាមការអនុញ្ញាតរបស់វា

e. សារធាតុខ្លះត្រូវ menbrame បង្ខំចេញទៅវិញ

38 / 60

Micro-aérophile គឺជាពពួកបាក់តេរីដែលត្រូវការ?

a. ខ្យល់ O2 តិចក៏បាន ច្រើើនក៏បាន

b. មានខ្យល់ O2 ច្រើន

c. មានខ្យល់ O2 តិច

d. មិនត្រូវខ្យល់ O2

39 / 60

គេប្រើl Microscope optique ពិនិត្យក្នុងសភាពរស់នៅ(á l ‘état frais) គឺសិក្សាពិនិត្យពី 😕

a. បាក់តេរី Grams positif

b. រូបរាង ( forme ) និងពីចលនា (mobilité ) ។

c. បាក់តេរី Grams négatif

d. រូបរាង ( forme )

40 / 60

សេចក្តីត្រូវការផ្នែកថាមពល ( besoins énergétique )សំរាប់ធ្វើសំយោគម៉ូលេគុលដែលជា សារធាតុសំខាន់ក្នុងការបង្កើតថាមពលរបស់បាក់តេរី?

a. carbone , Phosphore , Calcium, ជាតិស្ករ

b. ជាតិស្ករ ,ATP , A cétyl co-A , Glucose-6 Phosphate

c. ATP , ជាតិស្ករ , Calcium , O2

d. carbone , Phosphore , Calcium

41 / 60

Paroi នៃបាក់តេរី Gram. Positif ផ្សំដោយ?

a. gelatin

b. Peptido-glycane

c. Céramique and Peptido-glycane ត្រឹមត្រូវ

d. Céramique

42 / 60

Protoplaste គឺជាបាក់តេរីដែល?

a. មានស្រោម + paroi + enveloppe អត់មាន cytoplasme

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

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

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

43 / 60

Bactérie ដែលមិនអាចបង្កើត Spore មាន?

a. Staphylocoque

b. pneumocoque

c. coli bacille

d. All are corrects

e. streptocoque

44 / 60

បាក់តេរីដែលជាសត្រូវរបស់មនុស្សគឺ?

a. cryophile

b. Mésophile

c. Thermophile

d. psychophile

45 / 60

បាក់តេរី Doderlein អាចរស់នៅក្នុង milieu?

a. milieu acide + base

b. milieu acide

c. milieu base

d. milieu alcalin

46 / 60

បាក់តេរីប្រភេទ psychrophile អាចរស់នៅក្នុងសីតុណ្ហភាពជាមធ្យម?

a. ក្រោម 40 ˚C

b. ក្រោម 20 ˚C

c. លើសពី 20 ˚C

d. លើសពី 30 ˚C

47 / 60

ការជ្រាបចូលនៃសារធាតុនិង ចំណីអាហាររបស់បាក់តេរី កាលណាវាជា forme simple អាចជ្រាប ចូលដោយត្រង់ៗដូចជាសារធាតុ?

a. Acetyl-CoA

b. glucose, ATP ,Acide amine

c. ATP , glucose

d. Acide amine , ជាតិស្ករ

48 / 60

During AIDS, HIV infects?

a. CD4 lymphocytes

b. CD2 lymphocytes

c. B Lymphocytes

d. CD3 lymphocytes

49 / 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 Spirochetes

c. Fusobacterium nucleatum and Streptococcus mutans

d. Staphylococcus aureus and Streptococcus mutans

50 / 60

Cryptococcosis?

a. Is an infection caused by Cryptococcus neoformans

b. Is associated with dog lovers

c. Is a localized inflammation around and under the nails

d. Can cause cardiac abnormalities

51 / 60

Which microorganism implicated in pit and fissure caries?

a. Staphylococcus aureus

b. Actinimyces viscosus

c. Streptococcus mitis

d. Streptococcus mutans

52 / 60

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

a. Microaerophilic

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

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

d. Black pigmented Gram-positive

53 / 60

Fusobacterium Nucleatum 😕

a. Isolated from monomicrobial infections

b. Gram-positive, strictly anaerobic

c. Non capsulate diplococci

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

54 / 60

AIDS virus is ?

a. Enterovirus

b. Retro virus

c. DNA virus

d. RNA virus

55 / 60

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

a. Required by transient flora

b. Transferred by hands or objects

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

d. Transferred by insects bite.

56 / 60

The organisms most commonly associated with root caries are ?

a. Actinomyces viscosus

b. Porphyromonas gingivalis

c. Fusobacterium Nucleatum

d. Staphylococcus aureus

57 / 60

Main causative organism of chicken pox is?

a. Varicella Zoster virus

b. Mumps virus

c. Measles virus

d. Fox virus

58 / 60

Primary herpesvirus infections may cause:?

a. Herpes zoster

b. Herpetic gingivostomatitis

c. Meningititis

d. Herpes labialis

59 / 60

Which of the following statement on Actinobacillus actinomycetemcomitans are true?

a. Aggressive forms of periodontal disease in adolescents

b. Aggressive forms of dental caries in adolescents

c. cigar-shaped bacilli

d. Non-capsulate diplococcic

60 / 60

Certain strains of Streptococcus mutans?

a. Are cause of infective meningitides

b. Cause dental caries by the production of lactic and other acids, from fermentation of sugars

c. Cause of periodontal disease by the production of lactic and acids from fermentation of sugars

d. Extracellular glucan production.

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និស្សិតអាចប្រាប់មកកាន់ពួកយើងបានដើម្បីកែកំហុស ឬអំពីបញ្ហាដោយអចេតនាណាមួយដែលកើតមានកំឡុងពេលធ្វើតេស្ត