Oral Microbiology Preparation (Ph. Heng Kanika)

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590

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1) Porphyromonas gingivalis:?

a. Are aggressive periodontal pathogens

b. Are non-capsulated

c. Are isolated from many extra oral sites

d. Are Gram-positive pleomorphic rods

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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 Actinomyces viscosus

c. Fusobacterium nucleatum and Streptococcus mutans

d. Staphylococcus aureus and Streptococcus mutans

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3) Which microorganism implicated in pit and fissure caries?

a. Actinimyces viscosus

b. Staphylococcus aureus

c. Streptococcus mitis

d. Streptococcus mutans

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4) AIDS virus is ?

a. Enterovirus

b. RNA virus

c. DNA virus

d. Retro virus

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5) Main causative organism of chicken pox is?

a. Varicella Zoster virus

b. Measles virus

c. Mumps virus

d. Fox virus

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

a. A. Measles

b. Rubella

c. Mumps

d. Poliomyelitis

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7) 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. Bacteroides

d. Streptococcus

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

a. Actinomyces viscosus

b. Porphyromonas gingivalis

c. Staphylococcus aureus

d. Fusobacterium Nucleatum

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9) 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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10) Primary herpesvirus infections may cause:?

a. Herpes zoster

b. Herpes labialis

c. Meningititis

d. Herpetic gingivostomatitis

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

a. Hemolysin

b. Streptokinase

c. Hyaluronides

d. Phosphate

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12) 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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13) Causative agent of scarlet fever?

a. Streptococcus pyogens

b. Streptococcus viridans

c. None of these

d. Staphylococcus aureus

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14) Herpagina is usually cause by?

a. Hepatitis A virus

b. Cytomegalovirus

c. Group B coxackieviruses

d. Group A coxsackieviruses

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

a. leukotoxin A

b. Hyaluronidase

c. Streptodornas

d. hemolysine

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

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

b. Black pigmented Gram-positive

c. Microaerophilic

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

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17) Certain strains of Streptococcus mutans?

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

b. Are cause of infective meningitides

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

d. Extracellular glucan production.

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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. It causes chronic granulomatous infections

c. It is a eukaryote

d. Short rods, but often pleomorphic

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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) Cryptococcosis?

a. Is associated with dog lovers

b. Is an infection caused by Cryptococcus neoformans

c. Is a localized inflammation around and under the nails

d. Can cause cardiac abnormalities

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

a. Streptococcus sorbinus

b. Staphylococcus aureus

c. Staphylococcus epidermidis

d. Escherichia coli

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22) Mumps virus is belonging to?

a. None of these

b. Retroviriae

c. Paramyxoviridae

d. Orthomyxoviridae

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23) 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. Actinomyces

c. Staphylococcus aureus

d. Herpes simplex

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24) During AIDS, HIV infects?

a. CD3 lymphocytes

b. CD4 lymphocytes

c. CD2 lymphocytes

d. B Lymphocytes

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25) Fusobacterium Nucleatum 😕

a. Cause scarlet fever

b. Implicated in Dental caries

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

d. Black pigmented Gram-negative microorganism

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

a. Pericoronitis

b. Lateral periodontal abcess

c. Acute necrotizing ulcerative gingivitis

d. Herpetic stomatitis

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27) 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. Paramyxovirus

c. Herpes simplex

d. Herpes zoster

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28) 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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29) The virulence of Porphyromonas gingivalis is partly due to?

a. Cytotoxins

b. Hyaluronic acid

c. Proteases, haemolysin and collagenase

d. Adhesins

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30) Epstein-Barr Virus (EBV)?

a. Group A infect: skin and mucous membranes

b. Betaherpesvirus subfamily of herpesviruses

c. Achieves latency in sensory ganglia

d. Cause of infectious mononucleosis

Your score is

The average score is 86%

Any comments?

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