Oral Microbiology Preparation (Ph. Heng Kanika)

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

a. Black pigmented Gram-positive

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

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

d. Microaerophilic

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

a. Rubella

b. Mumps

c. A. Measles

d. Poliomyelitis

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3) 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. Paramyxovirus

b. Epstein-Barr

c. Herpes zoster

d. Herpes simplex

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4) During AIDS, HIV infects?

a. CD4 lymphocytes

b. CD3 lymphocytes

c. B Lymphocytes

d. CD2 lymphocytes

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5) 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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6) Cryptococcosis?

a. Is a localized inflammation around and under the nails

b. Is associated with dog lovers

c. Can cause cardiac abnormalities

d. Is an infection caused by Cryptococcus neoformans

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7) Herpagina is usually cause by?

a. Group B coxackieviruses

b. Group A coxsackieviruses

c. Hepatitis A virus

d. Cytomegalovirus

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8) 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. Extracellular glucan production.

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

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9) Fusobacterium Nucleatum 😕

a. Isolated from monomicrobial infections

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

c. Gram-positive, strictly anaerobic

d. Non capsulate diplococci

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10) Which microorganism implicated in pit and fissure caries?

a. Streptococcus mutans

b. Actinimyces viscosus

c. Staphylococcus aureus

d. Streptococcus mitis

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11) 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. Actinomyces

c. Staphylococcus aureus

d. Candida albicans

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

a. leukotoxin A

b. hemolysine

c. Streptodornas

d. Hyaluronidase

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

a. Short rods, but often pleomorphic

b. It is a eukaryote

c. It causes chronic granulomatous infections

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

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14) Causative agent of scarlet fever?

a. Streptococcus viridans

b. None of these

c. Streptococcus pyogens

d. Staphylococcus aureus

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15) Coxsakievirus have been found to replicate in the?

a. Small bowel

b. Sensory nerve

c. Reticuloendothelial system

d. Submucosal lymph tissue

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

a. Hyaluronides

b. Streptokinase

c. Hemolysin

d. Phosphate

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17) Main causative organism of chicken pox is?

a. Mumps virus

b. Varicella Zoster virus

c. Measles virus

d. Fox virus

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18) 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

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

a. Transferred by insects bite.

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

c. Transferred by hands or objects

d. Required by transient flora

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20) 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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21) 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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22) Primary herpesvirus infections may cause:?

a. Herpetic gingivostomatitis

b. Herpes zoster

c. Herpes labialis

d. Meningititis

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23) Mumps virus is belonging to?

a. Retroviriae

b. Orthomyxoviridae

c. Paramyxoviridae

d. None of these

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

a. Fusobacterium nucleatum and Streptococcus mutans

b. Fusobacterium nucleatum and Actinomyces viscosus

c. Fusobacterium nucleatum and Spirochetes

d. Staphylococcus aureus and Streptococcus mutans

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25) Porphyromonas gingivalis:?

a. Are isolated from many extra oral sites

b. Are Gram-positive pleomorphic rods

c. Are aggressive periodontal pathogens

d. Are non-capsulated

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26) Epstein-Barr Virus (EBV)?

a. Betaherpesvirus subfamily of herpesviruses

b. Cause of infectious mononucleosis

c. Group A infect: skin and mucous membranes

d. Achieves latency in sensory ganglia

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27) 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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28) AIDS virus is ?

a. Retro virus

b. Enterovirus

c. RNA virus

d. DNA virus

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

a. Non-capsulate diplococcic

b. cigar-shaped bacilli

c. Aggressive forms of periodontal disease in adolescents

d. Aggressive forms of dental caries in adolescents

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

a. Escherichia coli

b. Staphylococcus aureus

c. Streptococcus sorbinus

d. Staphylococcus epidermidis

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