Q. What is the main laboratory method used to identify Mycobacterium tuberculosis?
A.
Gram stain
B.
Acid-fast bacilli stain
C.
Culture on blood agar
D.
PCR
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Solution
The acid-fast bacilli stain is used to identify Mycobacterium tuberculosis due to its unique cell wall properties.
Correct Answer:
B
— Acid-fast bacilli stain
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Q. What is the primary mechanism by which Staphylococcus aureus causes disease?
A.
Production of exotoxins
B.
Invasion of host cells
C.
Formation of biofilms
D.
Induction of apoptosis
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Solution
Staphylococcus aureus produces various exotoxins that contribute to its pathogenicity, including enterotoxins and toxic shock syndrome toxin.
Correct Answer:
A
— Production of exotoxins
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Q. What is the primary mode of transmission for Neisseria gonorrhoeae?
A.
Airborne droplets
B.
Fecal-oral route
C.
Sexual contact
D.
Vector-borne transmission
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Solution
Neisseria gonorrhoeae is primarily transmitted through sexual contact, leading to gonorrhea.
Correct Answer:
C
— Sexual contact
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Q. What is the primary virulence factor of Escherichia coli O157:H7?
A.
Endotoxin
B.
Shiga toxin
C.
Capsule
D.
Flagella
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Solution
Escherichia coli O157:H7 produces Shiga toxin, which can cause severe gastrointestinal disease and hemolytic uremic syndrome.
Correct Answer:
B
— Shiga toxin
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Q. What laboratory test is most commonly used to diagnose streptococcal pharyngitis?
A.
Blood culture
B.
Rapid antigen detection test
C.
Complete blood count
D.
Urinalysis
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Solution
The rapid antigen detection test is commonly used to quickly diagnose streptococcal pharyngitis by detecting Group A Streptococcus antigens.
Correct Answer:
B
— Rapid antigen detection test
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Q. Which bacterium is most commonly associated with peptic ulcers?
A.
Escherichia coli
B.
Helicobacter pylori
C.
Streptococcus pneumoniae
D.
Clostridium difficile
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Solution
Helicobacter pylori is the bacterium most commonly linked to the development of peptic ulcers due to its ability to survive in the acidic environment of the stomach.
Correct Answer:
B
— Helicobacter pylori
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Q. Which of the following bacteria is known for causing a 'bull's-eye' rash in Lyme disease?
A.
Borrelia burgdorferi
B.
Rickettsia rickettsii
C.
Treponema pallidum
D.
Clostridium tetani
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Solution
Borrelia burgdorferi is the causative agent of Lyme disease, which is characterized by a 'bull's-eye' rash known as erythema migrans.
Correct Answer:
A
— Borrelia burgdorferi
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Q. Which of the following is a characteristic histopathological finding in tuberculosis?
A.
Caseating granulomas
B.
Cystic fibrosis
C.
Atypical mitotic figures
D.
Fibrinous necrosis
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Solution
Caseating granulomas are a hallmark of tuberculosis, formed as a response to the infection by Mycobacterium tuberculosis.
Correct Answer:
A
— Caseating granulomas
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Q. Which of the following is a common cause of community-acquired pneumonia?
A.
Staphylococcus aureus
B.
Klebsiella pneumoniae
C.
Streptococcus pneumoniae
D.
Pseudomonas aeruginosa
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Solution
Streptococcus pneumoniae is the most common cause of community-acquired pneumonia, often leading to lobar pneumonia.
Correct Answer:
C
— Streptococcus pneumoniae
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Q. Which of the following is a common complication of untreated streptococcal throat infection?
A.
Rheumatic fever
B.
Chronic bronchitis
C.
Pneumonia
D.
Tuberculosis
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Solution
Untreated streptococcal throat infections can lead to rheumatic fever, an inflammatory disease that can affect the heart, joints, and nervous system.
Correct Answer:
A
— Rheumatic fever
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