Oral Microbiology Preparation (Ph. Heng Kanika)

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

a. cigar-shaped bacilli

b. Non-capsulate diplococcic

c. Aggressive forms of dental caries in adolescents

d. Aggressive forms of periodontal disease in adolescents

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

a. Fusobacterium nucleatum and Spirochetes

b. Fusobacterium nucleatum and Streptococcus mutans

c. Fusobacterium nucleatum and Actinomyces viscosus

d. Staphylococcus aureus and Streptococcus mutans

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3) 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. Rubella

d. Mumps

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4) Coxsakievirus have been found to replicate in the?

a. Submucosal lymph tissue

b. Sensory nerve

c. Reticuloendothelial system

d. Small bowel

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5) Fusobacterium Nucleatum 😕

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

b. Cause scarlet fever

c. Implicated in Dental caries

d. Black pigmented Gram-negative microorganism

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

a. Proteases, haemolysin and collagenase

b. Hyaluronic acid

c. Cytotoxins

d. Adhesins

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7) Primary herpesvirus infections may cause:?

a. Herpetic gingivostomatitis

b. Herpes labialis

c. Herpes zoster

d. Meningititis

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8) During AIDS, HIV infects?

a. CD4 lymphocytes

b. B Lymphocytes

c. CD2 lymphocytes

d. CD3 lymphocytes

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

a. Microaerophilic

b. Black pigmented Gram-positive

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

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

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10) Herpagina is usually cause by?

a. Group B coxackieviruses

b. Group A coxsackieviruses

c. Hepatitis A virus

d. Cytomegalovirus

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

a. Streptodornas

b. Hyaluronidase

c. hemolysine

d. leukotoxin A

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12) Fusobacterium Nucleatum 😕

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

b. Gram-positive, strictly anaerobic

c. Isolated from monomicrobial infections

d. Non capsulate diplococci

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

a. Acute necrotizing ulcerative gingivitis

b. Pericoronitis

c. Herpetic stomatitis

d. Lateral periodontal abcess

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14) Porphyromonas gingivalis:?

a. Are non-capsulated

b. Are Gram-positive pleomorphic rods

c. Are isolated from many extra oral sites

d. Are aggressive periodontal pathogens

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15) Causative agent of scarlet fever?

a. Streptococcus viridans

b. Streptococcus pyogens

c. None of these

d. Staphylococcus aureus

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16) 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. Lactobacillus

c. Streptococcus

d. Staphylococcus

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

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

b. Transferred by hands or objects

c. Required by transient flora

d. Transferred by insects bite.

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19) AIDS virus is ?

a. Retro virus

b. RNA virus

c. DNA virus

d. Enterovirus

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20) 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. Candida albicans

b. Staphylococcus aureus

c. Herpes simplex

d. Actinomyces

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

a. Hemolysin

b. Phosphate

c. Hyaluronides

d. Streptokinase

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

a. Short rods, but often pleomorphic

b. It causes chronic granulomatous infections

c. It is a eukaryote

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

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24) Mumps virus is belonging to?

a. None of these

b. Paramyxoviridae

c. Orthomyxoviridae

d. Retroviriae

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

a. Actinomyces viscosus

b. Fusobacterium Nucleatum

c. Porphyromonas gingivalis

d. Staphylococcus aureus

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26) 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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27) Epstein-Barr Virus (EBV)?

a. Betaherpesvirus subfamily of herpesviruses

b. Achieves latency in sensory ganglia

c. Group A infect: skin and mucous membranes

d. Cause of infectious mononucleosis

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28) Which microorganism implicated in pit and fissure caries?

a. Streptococcus mutans

b. Streptococcus mitis

c. Actinimyces viscosus

d. Staphylococcus aureus

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29) 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

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30) Main causative organism of chicken pox is?

a. Measles virus

b. Mumps virus

c. Varicella Zoster virus

d. Fox virus

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