Oral Microbiology Preparation (Ph. Heng Kanika)

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1) 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. Poliomyelitis

d. Rubella

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2) 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.

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3) Certain strains of Streptococcus mutans?

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

b. Extracellular glucan production.

c. Are cause of infective meningitides

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

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4) Causative agent of scarlet fever?

a. Streptococcus pyogens

b. Streptococcus viridans

c. Staphylococcus aureus

d. None of these

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5) During AIDS, HIV infects?

a. B Lymphocytes

b. CD2 lymphocytes

c. CD3 lymphocytes

d. CD4 lymphocytes

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6) Which of the following statement on Actinobacillus actinomycetemcomitans are true?

a. cigar-shaped bacilli

b. Aggressive forms of dental caries in adolescents

c. Aggressive forms of periodontal disease in adolescents

d. Non-capsulate diplococcic

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7) Porphyromonas gingivalis:?

a. Are non-capsulated

b. Are isolated from many extra oral sites

c. Are Gram-positive pleomorphic rods

d. Are aggressive periodontal pathogens

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8) Primary herpesvirus infections may cause:?

a. Herpetic gingivostomatitis

b. Herpes zoster

c. Herpes labialis

d. Meningititis

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9) Fusobacterium Nucleatum 😕

a. Isolated from monomicrobial infections

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

c. Non capsulate diplococci

d. Gram-positive, strictly anaerobic

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10) Which microorganism implicated in pit and fissure caries?

a. Actinimyces viscosus

b. Streptococcus mitis

c. Streptococcus mutans

d. Staphylococcus aureus

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11) Several infections occur in the oral cavity that are of relevance to the dental team. Which of the following infections does virus cause?

a. Lateral periodontal abcess

b. Herpetic stomatitis

c. Acute necrotizing ulcerative gingivitis

d. Pericoronitis

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12) Which of the following statements on Actinomycetes are not true?

a. Short rods, but often pleomorphic

b. It infrequently causes actinomycoses of the jaws after tooth extractions

c. It causes chronic granulomatous infections

d. It is a eukaryote

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13) 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. Candida albicans

c. Staphylococcus aureus

d. Actinomyces

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

a. Staphylococcus aureus and Streptococcus mutans

b. Fusobacterium nucleatum and Streptococcus mutans

c. Fusobacterium nucleatum and Actinomyces viscosus

d. Fusobacterium nucleatum and Spirochetes

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15) AIDS virus is ?

a. Enterovirus

b. RNA virus

c. DNA virus

d. Retro virus

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16) Mumps virus is belonging to?

a. None of these

b. Orthomyxoviridae

c. Paramyxoviridae

d. Retroviriae

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17) 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. Epstein-Barr

c. Paramyxovirus

d. Herpes simplex

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

a. Staphylococcus epidermidis

b. Staphylococcus aureus

c. Escherichia coli

d. Streptococcus sorbinus

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19) Actinobacillus actinomycetemcomitans possesses certain virulence factors that enable it to invade tissues, such as ?

a. Hyaluronidase

b. Streptodornas

c. hemolysine

d. leukotoxin A

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20) Coxsakievirus have been found to replicate in the?

a. Small bowel

b. Submucosal lymph tissue

c. Sensory nerve

d. Reticuloendothelial system

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21) Epstein-Barr Virus (EBV)?

a. Achieves latency in sensory ganglia

b. Group A infect: skin and mucous membranes

c. Betaherpesvirus subfamily of herpesviruses

d. Cause of infectious mononucleosis

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

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

b. Microaerophilic

c. Black pigmented Gram-positive

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

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23) The virulence of Porphyromonas gingivalis is partly due to?

a. Cytotoxins

b. Proteases, haemolysin and collagenase

c. Hyaluronic acid

d. Adhesins

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24) The organisms most commonly associated with root caries are ?

a. Staphylococcus aureus

b. Porphyromonas gingivalis

c. Fusobacterium Nucleatum

d. Actinomyces viscosus

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25) Cryptococcosis?

a. Is an infection caused by Cryptococcus neoformans

b. Can cause cardiac abnormalities

c. Is associated with dog lovers

d. Is a localized inflammation around and under the nails

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26) Fusobacterium Nucleatum 😕

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

b. Black pigmented Gram-negative microorganism

c. Implicated in Dental caries

d. Cause scarlet fever

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27) 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. Lactobacillus

c. Streptococcus

d. Bacteroides

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28) Herpagina is usually cause by?

a. Hepatitis A virus

b. Group B coxackieviruses

c. Cytomegalovirus

d. Group A coxsackieviruses

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29) Toxins or enzymes which are not produced by streptococcus pyogenes?

a. Streptokinase

b. Hyaluronides

c. Phosphate

d. Hemolysin

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30) Main causative organism of chicken pox is?

a. Varicella Zoster virus

b. Mumps virus

c. Fox virus

d. Measles virus

Your score is

The average score is 3%

Any comments?

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