Oral Microbiology Test

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1 / 60

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

a. CO2 , O2 , acide gras , Nacl

b. O2 , H2O , Nacl , acide gras

c. Co2, O2, acide gras, polyose

d. CO2 , O2 , acide gras

2 / 60

បាក់តេរីប្រភេទ cryophile អាចរស់នៅក្នុងរង្វង់សីតុណ្ហភាព?

a. 4 ˚C

b. 6 ˚C

c. 8 ˚C

d. 10 ˚C

3 / 60

Paroi bactérie gram positif មានលក្ខណៈ?

a. ក្រាស់ មិនអាចជ្រាបអាល់កុល ហើយ bactérie ពណ៍ក្រហម

b. ក្រាស់ អាចជ្រាបអាល់កុល bactérie ពណ៍ស្វាយ

c. ស្តើង មិនជ្រាបអាល់កុល ហើយ bactérie ពណ៍ស្វាយ

d. ក្រាស់ មិនអាចជ្រាបអាល់កុល ហើយ bactérie ពណ៍ស្វាយ

4 / 60

បាក់តេរី Doderlein អាចរស់នៅក្នុង milieu?

a. milieu alcalin

b. milieu acide + base

c. milieu acide

d. milieu base

5 / 60

សេចក្តីត្រូវការផ្នែករូបធាតុក្នុងតំរូវការតិចមាន?

a. Ca , Mg , K, S , P , Fe

b. S . P . Fe

c. Ca . Mg . K

d. C. H . O2 .Z

6 / 60

សេចក្តីត្រូវការពិសេស ( besoins srécifique ) របស់បាក់តេរី?

a. ATP , Glucose -6-Phosphate , glucose

b. Acides amines , Base pyuvique , ATP

c. ATP , Glucose -6-Phosphate , glucose and Vitamine, base pyruvique , acide amine ត្រឹមត្រូវ

d. Vitamine, base pyruvique , acide amine

7 / 60

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

a. បាក់តេរី Grams négatif

b. រូបរាង ( forme )

c. រូបរាង ( forme ) និងពីចលនា (mobilité ) ។

d. បាក់តេរី Grams positif

8 / 60

Anaérobies strictes គឺពពួកបាក់តេរីដែលអាចរស់ និងលូតលាស់បានទាល់តែ?

a. មានខ្យល់ O2ច្រើន

b. មានខ្យល់ O2 តិច

c. មានខ្យល់ O2 ល្មម

d. គ្មានខ្យល់ O2 សោះ

9 / 60

Paroi bacterie gram négatif មានលក្ខណៈ?

a. ស្តើង អាល់កុលអាចជ្រាប ហើយ bactérie ពណ៍ក្រហម

b. ស្តើង អាល់កុលមិនអាចជ្រាបចូលបាន

c. ក្រាស់ អាល់កុលអាចជ្រាប ហើយ bactérie ពណ៍ខៀវ

d. ស្តើង អាល់កុលអាចជ្រាបហើយ bactérie ពណ៍ខៀវ

10 / 60

សារធាតុណាខ្លះដែលប្រឆាំង និងការរីកលូតលាស់របស់បាក់តេរី?

a. សារធាតុនៃ ពួក Antiseptique ខ្សោយ

b. សារធាតុនៃ ពពួក Antiseptique

c. សារធាតុនៃ ពួក Antiseptique ខ្លាំង

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

11 / 60

virus មានចរិកលក្ខណៈ នៃភាវរស់នៅរបស់វាទាំងអស់ចំនួន?

a. បី

b. បួន

c. ប្រាំមួយ

d. ប្រាំ

12 / 60

ក្នុងការជ្រាបចូលនៃចំណីអាហាររបស់បាក់តេរី perméase មានប៉ុន្មានប្រភេទ ?

a. 6ប្រភេទ

b. 5ប្រភេទ

c. 4ប្រភេទ

d. 3ប្រភេទ

13 / 60

Micro-aérophile គឺជាពពួកបាក់តេរីដែលត្រូវការ?

a. មានខ្យល់ O2 ច្រើន

b. មានខ្យល់ O2 តិច

c. ខ្យល់ O2 តិចក៏បាន ច្រើើនក៏បាន

d. មិនត្រូវខ្យល់ O2

14 / 60

បាក់តេរីប្រភេទ themophile អាចរស់នៅក្នុងសីតុណ្ហភាពជាមធ្យមលើសពី?

a. 40 ˚C

b. 30 ˚C

c. 20 ˚C

d. 37 ˚C

15 / 60

អ្វីទៅដែលហៅថា Ration totale របស់បាក់តេរី?

a. Ration d’entretien and បរិមាណចំណីអាហារទ្រទ្រង់បាក់តេរី

b. Ration de croissance and បរិមាណចំណីអាហារទ្រទ្រង់បាក់តេរី

c. Ration de croissance +បរិមាណចំណីអាហារសំរាប់លូតលាស់ដល់បាក់តេរី

d. Ration d’entretien, បរិមាណចំណីអាហារទ្រទ្រង់បាក់តេរី and Ration de croissane

16 / 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

17 / 60

Viruses can be cultivated in?

a. Tissue culture

b. Lab media

c. Blood culture.

d. Broth

18 / 60

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

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

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

c. substituting cariogenic artificial sweeteners

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

19 / 60

The most common protozoa in the oral cavity of people ?

a. Trichomonas tenax

b. Giardia muris

c. Entamoeba histolytica

d. Giardia lamblia.

20 / 60

Microorganisms play the most essential role.?

a. Dental caries is associated with:

b. Streptococcus mutans

c. Streptococcus anginosus.

d. Streptococcus agalactiae

e. Streptococcus bovis

21 / 60

Dentoalveolar abscess is treated by:?

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

b. Gingivectomy

c. Gingivoplasty

d. Periodontal flap procedure

22 / 60

How to manage dental caries?

a. Initial local debridement with ultrasonic scaling

b. Institute surgical drainage.

c. Minimal cavity preparation techniques

d. Eliminate primary source of infection

23 / 60

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

a. Probing

b. Laser fluorescence

c. Electrical impedance

d. Organoleptic assessment.

24 / 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

25 / 60

Caries, all are true except:?

a. Lactobacillus is the main causative organism in plaque

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

c. Smooth surface caries occur due to streptococcus mutans

d. Fluorides help in reducing caries incidence.

26 / 60

Aggressive periodontitis is treated by:?

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

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

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

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

27 / 60

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

a. Inflamed, red, shiny and bleeding gingivae

b. Loss of supporting tissues (noma).

c. Irregular alveolar bone loss around teeth

d. Unpleasant metallic taste

28 / 60

Normal flora help protect the body from pathogens … ?

a. by secreting histamines.

b. by attacking pathogenic bacteria

c. by sharing plasmids with pathogenic bacteria

d. by competing with other bacteria

29 / 60

Which of the following statements on streptococci are not true?

a. mutans group streptococci cause caries

b. Can cause caries in the absence of sucrose

c. Some are Gram-positive and anaerobic

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

30 / 60

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

a. produce intracellular dextrans.

b. produce extracellular proteolytic enzyme

c. exist regularly in the dental plaque

d. be lethal for animals

31 / 60

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

a. Streptococcus sanguinis

b. Porphyromonas gingivalis

c. Aggregatibacter actinomycetemcomitans

d. Prevotella intermedia.

32 / 60

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

a. Dental caries

b. Pulpitis.

c. Dentinal caries

d. Enamel caries

33 / 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.

34 / 60

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

a. lysozyme in saliva

b. cilia in the respiratory tract

c. cytotoxic T cells.

d. unbroken skin

35 / 60

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

a. Anaerobic.

b. Aerobic

c. Microaerophilic

d. Aerophilic

36 / 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. Reducing cariogenic flora

d. Institute surgical drainage.

37 / 60

Lysozyme is present in?

a. Cerebro spinal fluid (CSF)

b. Saliva.

c. Urine

d. Sweat

38 / 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. Bacteroides

b. Staphylococcus

c. Spirochaetes

d. Streptococcus.

39 / 60

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

a. alcohol

b. Cetylpyridinium.

c. essential oils

d. Chlorhexidine gluconate

40 / 60

Which of the following statements on aggressive periodontitis is EXACTE?

a. Initiation is onset of puberty

b. Prevalence and severity decrease with age

c. Most prevalent disease globally

d. 95% of all periodontal diseases.

41 / 60

Pathway in order of pathogenesis of oral infection:?

a. 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

b. 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

c. 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

d. 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

42 / 60

The most common bacteria that are always presence in mouth as a normal flora, which proposition is inexact?

a. D. Gonococcus

b. A. Streptococcus

c. B. Actinomyces

d. C. Prevotella

43 / 60

Principal Cocci Gram negative bacteria found in oral cavity:?

a. Veillonella

b. Enterococcus

c. Streptococcus

d. Gemella

44 / 60

Principal Rods Gram negative bacteria found in oral cavity:?

a. Porphyromonas

b. Lactobacillus

c. Eubacterium

d. Corynebacterium

45 / 60

Bacteria usually cause Necrotizing Ulcerative Gingivitis?

a. Fusiform bacillus and Capnocytophaga sputigena

b. Borrelia vincentii and Eikenella corrodens

c. Fusiform bacillus and Borrelia vincentii

d. Borrelia vincentii and Porphyromonas endodontalis

46 / 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

47 / 60

Antibiotic which is common use to treat anaerobic bacteria 😕

a. Metronidazole

b. Colistin

c. Vancomycin

d. Gentamicin

48 / 60

Among 4 phases of biofilm formation, the phase that is done the longest, about 7-14 days is:?

a. Phase 1

b. Phase 2

c. Phase 4

d. Phase 3

49 / 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. Klebsiella pneumoniae

b. Mycobacterium tuberculosis

c. Pseudomonas aeruginosa

d. Streptococcus pneumoniae

50 / 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. Prevotella intermedia, Fusobacterium nucleatum, Porphyromonas endodontalis, Prevotella tannerae

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

51 / 60

In dental caries, the protective factor is 😕

a. Antibacterials ( fluorides, Chlorhexidine, Xylitol)

b. Acid producing bacteria

c. Frequent eating / drinking of fermentable carbohydrates

d. Poor oral hygiene

52 / 60

Steps in order for biofilm formation:?

a. Adhesion, colonization, coadhesion , maturation and detachment

b. Coadhesion , adhesion, colonization, maturation and detachment

c. Colonization , adhesion, coadhesion , maturation and detachment

d. Maturation and detachment, adhesion, colonization, coadhesion

53 / 60

Major bacteria cause periodontitis 😕

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

b. Fusobacterium nucleatum, Petostreptococcus micros, Streptococci, Pneumococcus

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

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

54 / 60

Fusobacterium Nucleatum 😕

a. Black pigmented Gram-negative microorganism

b. Plays a crucial role in the beginning of periodontal disease

c. Implicated in Dental caries

d. Cause scarlet fever

55 / 60

Cryptococcosis?

a. Is associated with dog lovers

b. Is a localized inflammation around and under the nails

c. Is an infection caused by Cryptococcus neoformans

d. Can cause cardiac abnormalities

56 / 60

Which microorganism implicated in pit and fissure caries?

a. Actinimyces viscosus

b. Staphylococcus aureus

c. Streptococcus mitis

d. Streptococcus mutans

57 / 60

Toxins or enzymes which are not produced by streptococcus pyogenes?

a. Streptokinase

b. Hyaluronides

c. Hemolysin

d. Phosphate

58 / 60

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

a. Fusobacterium nucleatum and Spirochetes

b. Staphylococcus aureus and Streptococcus mutans

c. Fusobacterium nucleatum and Streptococcus mutans

d. Fusobacterium nucleatum and Actinomyces viscosus

59 / 60

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

a. Poliomyelitis

b. Rubella

c. Mumps

d. A. Measles

60 / 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. Staphylococcus aureus

b. Candida albicans

c. Actinomyces

d. Herpes simplex

Your score is

The average score is 86%

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និស្សិតអាចប្រាប់មកកាន់ពួកយើងបានដើម្បីកែកំហុស ឬអំពីបញ្ហាដោយអចេតនាណាមួយដែលកើតមានកំឡុងពេលធ្វើតេស្ត