Oral Microbiology Preparation (Ph. Heng Kanika)

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

a. Transferred by hands or objects

b. Transferred by insects bite.

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

d. Required by transient flora

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

a. Proteases, haemolysin and collagenase

b. Cytotoxins

c. Hyaluronic acid

d. Adhesins

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3) Causative agent of scarlet fever?

a. Staphylococcus aureus

b. Streptococcus pyogens

c. Streptococcus viridans

d. None of these

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4) Coxsakievirus have been found to replicate in the?

a. Small bowel

b. Reticuloendothelial system

c. Submucosal lymph tissue

d. Sensory nerve

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5) 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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6) 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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7) Cryptococcosis?

a. Is associated with dog lovers

b. Is a localized inflammation around and under the nails

c. Can cause cardiac abnormalities

d. Is an infection caused by Cryptococcus neoformans

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

a. Non-capsulate diplococcic

b. Aggressive forms of dental caries in adolescents

c. cigar-shaped bacilli

d. Aggressive forms of periodontal disease in adolescents

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9) Epstein-Barr Virus (EBV)?

a. Cause of infectious mononucleosis

b. Betaherpesvirus subfamily of herpesviruses

c. Achieves latency in sensory ganglia

d. Group A infect: skin and mucous membranes

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

a. Mumps

b. Rubella

c. Poliomyelitis

d. A. Measles

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11) Main causative organism of chicken pox is?

a. Measles virus

b. Varicella Zoster virus

c. Fox virus

d. Mumps virus

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

a. hemolysine

b. Hyaluronidase

c. Streptodornas

d. leukotoxin A

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13) Herpagina is usually cause by?

a. Cytomegalovirus

b. Hepatitis A virus

c. Group B coxackieviruses

d. Group A coxsackieviruses

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14) 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. Pericoronitis

c. Acute necrotizing ulcerative gingivitis

d. Herpetic stomatitis

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

a. Staphylococcus aureus

b. Fusobacterium Nucleatum

c. Actinomyces viscosus

d. Porphyromonas gingivalis

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16) Primary herpesvirus infections may cause:?

a. Herpes zoster

b. Herpes labialis

c. Meningititis

d. Herpetic gingivostomatitis

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17) Which microorganism implicated in pit and fissure caries?

a. Actinimyces viscosus

b. Streptococcus mitis

c. Staphylococcus aureus

d. Streptococcus mutans

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

a. Streptokinase

b. Phosphate

c. Hyaluronides

d. Hemolysin

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

a. Staphylococcus epidermidis

b. Staphylococcus aureus

c. Streptococcus sorbinus

d. Escherichia coli

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20) Mumps virus is belonging to?

a. Paramyxoviridae

b. Retroviriae

c. None of these

d. Orthomyxoviridae

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

a. Short rods, but often pleomorphic

b. It is a eukaryote

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

d. It causes chronic granulomatous infections

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22) 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. Staphylococcus aureus

c. Actinomyces

d. Candida albicans

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23) AIDS virus is ?

a. DNA virus

b. Retro virus

c. Enterovirus

d. RNA virus

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24) During AIDS, HIV infects?

a. CD4 lymphocytes

b. B Lymphocytes

c. CD3 lymphocytes

d. CD2 lymphocytes

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25) Fusobacterium Nucleatum 😕

a. Implicated in Dental caries

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

c. Cause scarlet fever

d. Black pigmented Gram-negative microorganism

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26) 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. Lactobacillus

d. Streptococcus

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27) Fusobacterium Nucleatum 😕

a. Gram-positive, strictly anaerobic

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

c. Non capsulate diplococci

d. Isolated from monomicrobial infections

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28) Porphyromonas gingivalis:?

a. Are non-capsulated

b. Are Gram-positive pleomorphic rods

c. Are aggressive periodontal pathogens

d. Are isolated from many extra oral sites

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29) 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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30) 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. Paramyxovirus

d. Herpes simplex

Your score is

The average score is 86%

Any comments?

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