Oral Microbiology Test

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1 / 60

បរិមាណចំណីអាហារសំរាប់សាងសង់និង ដើម្បីថាមពលហៅថា?

a. Ration d’entretien and Ration totale

b. Ration d’entretien

c. ration de croissance

d. Ration totale

2 / 60

សារធាតុណាខ្លះដែលប្រឆាំង និងការរីកលូតលាស់របស់បាក់តេរី?

a. សារធាតុនៃ ពួក Antiseptique ខ្លាំង

b. សារធាតុនៃ ពួក Antiseptique ខ្សោយ

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

d. សារធាតុនៃ ពពួក Antiseptique

3 / 60

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

a. ពីចលនា (mobilité ) រូបរាង ( forme )

b. ដោយការកាត់- ពុះខ្លួនបាក់តេរី

c. បាក់តេរី Grams positif

d. បាក់តេរី Grams positif ឬ Grams négatif

4 / 60

Mycoplasme គឺជាពពួកបាក់តេរីដែលគ្មាន?

a. ភ្នាសស៊ីតូប្លាស

b. capsule + paroi

c. Paroi

d. glycocalix + paroi

5 / 60

ដើម្បីរស់ បាក់តេរីការចំណីអាហារប៉ុន្មានភាគរយ នៃ Ration totale សំរាប់ការរស់នៅក្នុងធម្មជាតិ?

a. 1/300

b. 1/500

c. 1/400

d. 1/600

6 / 60

បាក់តេរីដែលជាសត្រូវរបស់មនុស្សគឺ?

a. psychophile

b. Thermophile

c. Mésophile

d. cryophile

7 / 60

Micro-aérophile គឺជាពពួកបាក់តេរីដែលត្រូវការ?

a. មានខ្យល់ O2 ច្រើន

b. មានខ្យល់ O2 តិច

c. មិនត្រូវខ្យល់ O2

d. ខ្យល់ O2 តិចក៏បាន ច្រើើនក៏បាន

8 / 60

នៅក្នុង condition physico-chimique de la croissance របស់បាក់តេរីក្នុងល័ក្ខខណ្ឌ័ Perssions partielles d’oxygène គេបែងចែកបាក់តេរីជាច្រើនប្រភេទ?

a. Aérobies-anaérobie facultative and érobies strictes , Micro-aérophiles, anaérobies stricte

b. Aérobies strictes , Micro-aérophiles, anaérobies stricte

c. Mésophile + Micro-aérophiles,anaérobies stricte

d. Aérobies-anaérobie facultative

9 / 60

Paroi bacterie gram négatif មានលក្ខណៈ?

a. ក្រាស់ អាល់កុលអាចជ្រាប ហើយ bactérie ពណ៍ខៀវ

b. ស្តើង អាល់កុលអាចជ្រាប ហើយ bactérie ពណ៍ក្រហម

c. ស្តើង អាល់កុលអាចជ្រាបហើយ bactérie ពណ៍ខៀវ

d. ស្តើង អាល់កុលមិនអាចជ្រាបចូលបាន

10 / 60

ភាគច្រើននៃពពួកបាក់តេរីធ្វើការលូតលាស់នៅ pH?

a. pH 6-6.5

b. pH : 9-10

c. pH : 7-7.5

d. pH : 8-9

11 / 60

Paroi នៃបាក់តេរី Gram. Positif ផ្សំដោយ?

a. Peptido-glycane

b. Céramique and Peptido-glycane ត្រឹមត្រូវ

c. gelatin

d. Céramique

12 / 60

Paroi bactérie gram positif មានលក្ខណៈ?

a. ក្រាស់ មិនអាចជ្រាបអាល់កុល ហើយ bactérie ពណ៍ក្រហម

b. ក្រាស់ មិនអាចជ្រាបអាល់កុល ហើយ bactérie ពណ៍ស្វាយ

c. ក្រាស់ អាចជ្រាបអាល់កុល bactérie ពណ៍ស្វាយ

d. ស្តើង មិនជ្រាបអាល់កុល ហើយ bactérie ពណ៍ស្វាយ

13 / 60

ពពួកបាក់តេរីដែលគ្មាន peptide-glycane តែមាន enveloppe externe និងភ្នាសcytoplasmique ហៅថា ?

a. Sphéroplaste

b. Mésophile

c. Protoplastes

d. Mycoplasme

14 / 60

បាក់តេរីប្រភេទ psychrophile អាចរស់នៅក្នុងសីតុណ្ហភាពជាមធ្យម?

a. ក្រោម 20 ˚C

b. ក្រោម 40 ˚C

c. លើសពី 30 ˚C

d. លើសពី 20 ˚C

15 / 60

Pathway in order of pathogenesis of oral infection:?

a. 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

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. 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

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

16 / 60

Which bacteria that is not presence in buccal mucosa?

a. Streptococcus mutans

b. Streptococcus mitis

c. Streptococcus anginosus

d. Treponema palidum

17 / 60

Factor that does not influence to dental caries?

a. Size and form of teeth

b. Duration and frequency of exposure

c. Individual factor

d. Substrate for microorganisms

18 / 60

A bacterium that never found in tooth surface:?

a. Streptococcus pneumoniae

b. Streptococcus mutans

c. Streptococcus anginosus

d. Streptococcus mitis

19 / 60

Principal Rods Gram positive bacteria found in oral cavity:?

a. Prevotella

b. Simonsiella

c. Eikenella

d. Actinomyces

20 / 60

Which bacteria that is not always presence in saliva:?

a. Streptococcus oralis

b. Streptococcus salivarius

c. Streptococcus agalactiae

d. Streptococcus mitis

21 / 60

Strategy to control of biofilm pH in oral biofilm:?

a. Inhibition of key microbial enzyme

b. Fluoride

c. Generating nutrients

d. Antiflammatory agents

22 / 60

Microorganisms in oral tissue can cause 😕

a. Systemic infection

b. Only local infection

c. Local infection

d. Both, local and systemic infection

23 / 60

Strategy to control of rendox potential in oral biofilm:?

a. Inhibition of key microbial enzyme

b. Oxygenating agents

c. Stimulate base production

d. Fluoride

24 / 60

Oral opportunistic infection happens when:?

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

b. An organism that usually is pathogenic becomes normal flora

c. An organism that usually is pathogenic causes disease

d. An organism that usually is nonpathogenic causes disease

25 / 60

Analytical techniques for monitoring biofilms by “Indirect detection” 😕

a. Detection of proteins by molecular biology technique

b. Microscopy techniques

c. High Pressure Liquid Chromatography (HPLC)

d. Detection of DNA by molecular biology technique

26 / 60

The comment bacterium causes dental caries:?

a. E.coli

b. Staphylococcus aureus

c. Pseudomonas aeruginosa

d. Mutans Streptococci

27 / 60

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

a. Pseudomonas

b. Helicobacter

c. Enterococcus

d. Staphylococcus

28 / 60

Specificity of Anaerobic bacteria, except:?

a. Foul odor when opening anaerobic jar or bag

b. Incubation culture in 1-2 days

c. Black pigmentation on culture

d. Grow on anaerobic media culture

29 / 60

Principal Cocci Gram negative bacteria found in oral cavity:?

a. Veillonella

b. Streptococcus

c. Enterococcus

d. Gemella

30 / 60

Bacteria usually cause Necrotizing Ulcerative Gingivitis?

a. Borrelia vincentii and Eikenella corrodens

b. Fusiform bacillus and Borrelia vincentii

c. Borrelia vincentii and Porphyromonas endodontalis

d. Fusiform bacillus and Capnocytophaga sputigena

31 / 60

Herpagina is usually cause by?

a. Group B coxackieviruses

b. Group A coxsackieviruses

c. Cytomegalovirus

d. Hepatitis A virus

32 / 60

There are many different types of bacteria normally present in the oral cavity. Which of the following is the name of the one most likely to be associated with the onset of dental caries?

a. Streptococcus

b. Bacteroides

c. Lactobacillus

d. Staphylococcus

33 / 60

Fusobacterium Nucleatum 😕

a. Gram-positive, strictly anaerobic

b. Non capsulate diplococci

c. Isolated from monomicrobial infections

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

34 / 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. Herpes zoster

b. Paramyxovirus

c. Herpes simplex

d. Epstein-Barr

35 / 60

Epstein-Barr Virus (EBV)?

a. Cause of infectious mononucleosis

b. Achieves latency in sensory ganglia

c. Group A infect: skin and mucous membranes

d. Betaherpesvirus subfamily of herpesviruses

36 / 60

Causative agent of scarlet fever?

a. None of these

b. Streptococcus viridans

c. Streptococcus pyogens

d. Staphylococcus aureus

37 / 60

Main causative organism of chicken pox is?

a. Mumps virus

b. Varicella Zoster virus

c. Fox virus

d. Measles virus

38 / 60

Lysozyme is present in?

a. Urine

b. Sweat

c. Cerebro spinal fluid (CSF)

d. Saliva.

39 / 60

What is the cause of death in Ludwig angina?

a. Wall rupture.

b. Asphyxia

c. Dysrhythmia

d. Pneumonia

40 / 60

Which of the following statements on dentoalveolar infections is INEXACTE?

a. Pus-producing infections associated with teeth and surrounding supporting structures

b. Endogenous oral commensals, usually from apex of a necrotic tooth

c. Prevalence and severity increase with age

d. Clinical presentation depends on virulence of causative microorganisms.

41 / 60

With regard to prevention of dental caries, which of the following statements are true?

a. water fluoridation, though effective, leads to other major systemic illnesses

b. probiotic therapy with ‘cariogenic’ bacteria is the most promising approach

c. remineralization of early lesions can be accomplished by fluoridated toothpaste.

d. substituting cariogenic artificial sweeteners

42 / 60

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

a. Birth-6 months

b. 10-13 years.

c. 5-7 years

d. 1-3 years

43 / 60

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

a. Pseudomembrane (slough)

b. White-spot lesion.

c. Roughened and cavitation

d. Chalkywhite lesion

44 / 60

Mouthwashes used for controlling oral malodor should contain?

a. Sugar to make them more palatable to consumers

b. Xylitol.

c. Alcohol

d. Antibacterial agent

45 / 60

Which of the following bacteria that is predominant in chronic periodontitis?

a. Streptococcus sanguinis

b. Prevotella intermedia.

c. Actinomyces viscsus

d. Porphyromonas gingivalis

46 / 60

How to manage acute necrotizing ulcerative gingivitis?

a. Institute surgical drainage.

b. Initial local debridement by ultrasonic scaling

c. Reducing cariogenic flora

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

47 / 60

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

a. Wearing a single face mask for 3 h

b. Wearing gloves after removal of all hand jewellery.

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

d. Wearing headgear for all operational procedures

48 / 60

What are the predominant plaque bacteria in healthy condition?

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

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

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

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

49 / 60

There are many different types of bacteria normally present in the oral cavity. Which of the following is the name of the one most likely to be associated with the onset of dental caries?

a. Staphylococcus

b. Spirochaetes

c. Bacteroides

d. Streptococcus.

50 / 60

Chronic periodontitis is characterized by INEXACT:?

a. systemic symptoms like fever

b. absence of pain in general.

c. gingival recession

d. tooth mobility and migration

51 / 60

Which of the following disease most commonly afflicts human?

a. Periodontal disease

b. Periodontal abscess.

c. Ludwig’s angina

d. Dentoalveolar abscess

52 / 60

Which of the following statements on streptococci are not true?

a. Can cause caries in the absence of sucrose

b. Some are Gram-positive and anaerobic

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

d. mutans group streptococci cause caries

53 / 60

Normal flora help protect the body from pathogens … ?

a. by sharing plasmids with pathogenic bacteria

b. by attacking pathogenic bacteria

c. by secreting histamines.

d. by competing with other bacteria

54 / 60

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

a. Streptococcus pyogenes

b. Streptococcus mutans

c. Streptococcus saprophyticus

d. Streptococcus pneumonia.

55 / 60

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

a. cilia in the respiratory tract

b. lysozyme in saliva

c. unbroken skin

d. cytotoxic T cells.

56 / 60

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

a. Electrical impedance

b. Organoleptic assessment.

c. Probing

d. Laser fluorescence

57 / 60

Caries, all are true except:?

a. Lactobacillus is the main causative organism in plaque

b. Fluorides help in reducing caries incidence.

c. Smooth surface caries occur due to streptococcus mutans

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

58 / 60

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

a. Spikes

b. Adhesins

c. Glycocalyx.

d. Fimbriae (pili)

59 / 60

Which of the following statements on dentoalveolar abscess is true?

a. it often resolves without antibiotics after adequate drainage.

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

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

d. it is a infection of sublingual and submandibular spaces

60 / 60

Members of the genus Lactobacillus are normal microflora of the?

a. Mouth

b. Hair

c. Nasopharynx.

d. Skin

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និស្សិតអាចប្រាប់មកកាន់ពួកយើងបានដើម្បីកែកំហុស ឬអំពីបញ្ហាដោយអចេតនាណាមួយដែលកើតមានកំឡុងពេលធ្វើតេស្ត