Oral Microbiology Preparation (Ph. Heng Kanika)

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1) Porphyromonas gingivalis:?

a. Are isolated from many extra oral sites

b. Are aggressive periodontal pathogens

c. Are non-capsulated

d. Are Gram-positive pleomorphic rods

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2) Coxsakievirus have been found to replicate in the?

a. Submucosal lymph tissue

b. Small bowel

c. Sensory nerve

d. Reticuloendothelial system

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3) Main causative organism of chicken pox is?

a. Mumps virus

b. Measles virus

c. Varicella Zoster virus

d. Fox virus

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4) Fusobacterium Nucleatum 😕

a. Non capsulate diplococci

b. Gram-positive, strictly anaerobic

c. Isolated from monomicrobial infections

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

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5) Mumps virus is belonging to?

a. Retroviriae

b. None of these

c. Orthomyxoviridae

d. Paramyxoviridae

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6) Epstein-Barr Virus (EBV)?

a. Cause of infectious mononucleosis

b. Achieves latency in sensory ganglia

c. Betaherpesvirus subfamily of herpesviruses

d. Group A infect: skin and mucous membranes

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7) Fusobacterium Nucleatum 😕

a. Cause scarlet fever

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

c. Black pigmented Gram-negative microorganism

d. Implicated in Dental caries

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8) Causative agent of scarlet fever?

a. Streptococcus viridans

b. None of these

c. Streptococcus pyogens

d. Staphylococcus aureus

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

a. Cytotoxins

b. Adhesins

c. Hyaluronic acid

d. Proteases, haemolysin and collagenase

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10) 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

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

a. A. Measles

b. Poliomyelitis

c. Mumps

d. Rubella

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

a. leukotoxin A

b. Hyaluronidase

c. hemolysine

d. Streptodornas

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13) AIDS virus is ?

a. RNA virus

b. DNA virus

c. Enterovirus

d. Retro virus

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14) 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. Lactobacillus

b. Bacteroides

c. Streptococcus

d. Staphylococcus

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15) Primary herpesvirus infections may cause:?

a. Herpes labialis

b. Herpetic gingivostomatitis

c. Herpes zoster

d. Meningititis

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

a. Staphylococcus epidermidis

b. Streptococcus sorbinus

c. Staphylococcus aureus

d. Escherichia coli

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

a. Phosphate

b. Hemolysin

c. Hyaluronides

d. Streptokinase

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

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

b. Short rods, but often pleomorphic

c. It causes chronic granulomatous infections

d. It is a eukaryote

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19) Cryptococcosis?

a. Can cause cardiac abnormalities

b. Is associated with dog lovers

c. Is an infection caused by Cryptococcus neoformans

d. Is a localized inflammation around and under the nails

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

a. Staphylococcus aureus

b. Fusobacterium Nucleatum

c. Porphyromonas gingivalis

d. Actinomyces viscosus

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

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

b. Microaerophilic

c. Black pigmented Gram-positive

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

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22) Which microorganism implicated in pit and fissure caries?

a. Actinimyces viscosus

b. Staphylococcus aureus

c. Streptococcus mitis

d. Streptococcus mutans

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23) Herpagina is usually cause by?

a. Cytomegalovirus

b. Hepatitis A virus

c. Group B coxackieviruses

d. Group A coxsackieviruses

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24) 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

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25) 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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26) Certain strains of Streptococcus mutans?

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

b. Extracellular glucan production.

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

d. Are cause of infective meningitides

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

a. cigar-shaped bacilli

b. Aggressive forms of periodontal disease in adolescents

c. Aggressive forms of dental caries in adolescents

d. Non-capsulate diplococcic

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28) During AIDS, HIV infects?

a. CD2 lymphocytes

b. CD3 lymphocytes

c. CD4 lymphocytes

d. B Lymphocytes

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29) 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. Transferred by insects bite.

d. Required by transient flora

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30) 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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