Oral Microbiology Preparation (Ph. Heng Kanika)

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1) Which microorganism implicated in pit and fissure caries?

a. Streptococcus mitis

b. Streptococcus mutans

c. Actinimyces viscosus

d. Staphylococcus aureus

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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. Mumps

b. Rubella

c. Poliomyelitis

d. A. Measles

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

a. Transferred by insects bite.

b. Transferred by hands or objects

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

d. Required by transient flora

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4) 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. Streptococcus

c. Bacteroides

d. Staphylococcus

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5) 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. Candida albicans

c. Staphylococcus aureus

d. Actinomyces

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6) AIDS virus is ?

a. Retro virus

b. RNA virus

c. Enterovirus

d. DNA virus

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7) 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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8) During AIDS, HIV infects?

a. CD3 lymphocytes

b. B Lymphocytes

c. CD2 lymphocytes

d. CD4 lymphocytes

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

a. It causes chronic granulomatous infections

b. Short rods, but often pleomorphic

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

d. It is a eukaryote

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10) Mumps virus is belonging to?

a. None of these

b. Retroviriae

c. Orthomyxoviridae

d. Paramyxoviridae

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11) 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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12) The virulence of Porphyromonas gingivalis is partly due to?

a. Proteases, haemolysin and collagenase

b. Adhesins

c. Cytotoxins

d. Hyaluronic acid

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13) Epstein-Barr Virus (EBV)?

a. Group A infect: skin and mucous membranes

b. Achieves latency in sensory ganglia

c. Cause of infectious mononucleosis

d. Betaherpesvirus subfamily of herpesviruses

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14) Porphyromonas gingivalis:?

a. Are Gram-positive pleomorphic rods

b. Are isolated from many extra oral sites

c. Are non-capsulated

d. Are aggressive periodontal pathogens

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

a. Aggressive forms of dental caries in adolescents

b. Non-capsulate diplococcic

c. Aggressive forms of periodontal disease in adolescents

d. cigar-shaped bacilli

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

a. Streptokinase

b. Hemolysin

c. Phosphate

d. Hyaluronides

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18) Fusobacterium Nucleatum 😕

a. Implicated in Dental caries

b. Black pigmented Gram-negative microorganism

c. Cause scarlet fever

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

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19) Cryptococcosis?

a. Is a localized inflammation around and under the nails

b. Is associated with dog lovers

c. Is an infection caused by Cryptococcus neoformans

d. Can cause cardiac abnormalities

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20) Herpagina is usually cause by?

a. Hepatitis A virus

b. Cytomegalovirus

c. Group B coxackieviruses

d. Group A coxsackieviruses

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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. Pericoronitis

b. Herpetic stomatitis

c. Lateral periodontal abcess

d. Acute necrotizing ulcerative gingivitis

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22) Coxsakievirus have been found to replicate in the?

a. Reticuloendothelial system

b. Sensory nerve

c. Submucosal lymph tissue

d. Small bowel

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23) Primary herpesvirus infections may cause:?

a. Meningititis

b. Herpetic gingivostomatitis

c. Herpes labialis

d. Herpes zoster

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24) Main causative organism of chicken pox is?

a. Fox virus

b. Varicella Zoster virus

c. Mumps virus

d. Measles virus

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25) Causative agent of scarlet fever?

a. Staphylococcus aureus

b. Streptococcus pyogens

c. Streptococcus viridans

d. None of these

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26) Fusobacterium Nucleatum 😕

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

b. Non capsulate diplococci

c. Gram-positive, strictly anaerobic

d. Isolated from monomicrobial infections

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27) Certain strains of Streptococcus mutans?

a. Extracellular glucan production.

b. Are cause of infective meningitides

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

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

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

a. Actinomyces viscosus

b. Porphyromonas gingivalis

c. Fusobacterium Nucleatum

d. Staphylococcus aureus

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

a. leukotoxin A

b. Hyaluronidase

c. hemolysine

d. Streptodornas

Your score is

The average score is 3%

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