Microbiology questions and answers pdf chapter 15, 16

Here are the most important questions and answers in pdf microbiology chapter 15, 16

1. Which staining method is commonly used to differentiate between Gram-positive and Gram-negative bacteria?

  • A) Acid-fast staining
  • B) Ziehl-Neelsen staining
  • C) Gram staining
  • Correct Answer: C) Gram staining

2. What is the characteristic arrangement of Staphylococcus bacteria?

  • A) Chains
  • B) Clusters
  • C) Pairs
  • Correct Answer: B) Clusters

3. Which species of Staphylococcus is commonly found on the skin and mucous membranes of humans?

  • A) Staphylococcus aureus
  • B) Staphylococcus epidermidis
  • C) Staphylococcus pneumoniae
  • Correct Answer: B) Staphylococcus epidermidis

4. Streptococcus pneumoniae is known for causing which respiratory infection?

  • A) Strep throat
  • B) Pneumonia
  • C) Tuberculosis
  • Correct Answer: B) Pneumonia

5. What is the primary distinguishing feature of Enterococcus among Gram-positive cocci?

  • A) Ability to form biofilms
  • B) Growth in bile salts
  • C) Production of coagulase
  • Correct Answer: B) Growth in bile salts

6. Which group of Streptococcus is commonly associated with causing dental caries?

  • A) Group A Streptococcus
  • B) Group B Streptococcus
  • C) Viridans group Streptococcus
  • Correct Answer: C) Viridans group Streptococcus

7. Which Gram-positive cocci species is a major cause of skin infections, including boils and abscesses?

  • A) Streptococcus pyogenes
  • B) Staphylococcus aureus
  • C) Enterococcus faecalis
  • Correct Answer: B) Staphylococcus aureus

8. What is the primary virulence factor of Staphylococcus aureus?

  • A) Hemolysins
  • B) Coagulase
  • C) Catalase
  • Correct Answer: B) Coagulase

9. Which bacterium is associated with causing toxic shock syndrome (TSS)?

  • A) Streptococcus pneumoniae
  • B) Staphylococcus aureus
  • C) Enterococcus faecalis
  • Correct Answer: B) Staphylococcus aureus

10. Streptococcus agalactiae is commonly associated with infections in which population?
– A) Neonates
– B) Elderly individuals
– C) Adolescents
Correct Answer: A) Neonates

11. Which of the following is a characteristic feature of Streptococcus pneumoniae on blood agar?
– A) Beta-hemolysis
– B) Alpha-hemolysis
– C) Gamma-hemolysis
Correct Answer: B) Alpha-hemolysis

12. What type of hemolysis is typically associated with Staphylococcus aureus on blood agar?
– A) Beta-hemolysis
– B) Alpha-hemolysis
– C) Gamma-hemolysis
Correct Answer: A) Beta-hemolysis

13. Which of the following is a common manifestation of Streptococcus pyogenes infection?
– A) Impetigo
– B) Urinary tract infection
– C) Meningitis
Correct Answer: A) Impetigo

14. What is the primary mode of transmission of Streptococcus agalactiae to neonates?
– A) Airborne transmission
– B) Contact with contaminated surfaces
– C) Maternal transmission during childbirth
Correct Answer: C) Maternal transmission during childbirth

15. Which of the following is a common feature of Enterococcus faecalis?
– A) Optochin sensitivity
– B) Bile salt resistance
– C) Bacitracin resistance
Correct Answer: B) Bile salt resistance

16. What type of infection is commonly associated with Staphylococcus epidermidis in hospital settings?
– A) Skin infections
– B) Urinary tract infections
– C) Nosocomial infections related to medical devices
Correct Answer: C) Nosocomial infections related to medical devices

17. Which Streptococcus species is commonly found in the oral cavity and is associated with dental plaque?
– A) Streptococcus pneumoniae
– B) Streptococcus mutans
– C) Streptococcus agalactiae
Correct Answer: B) Streptococcus mutans

18. What is the primary distinguishing feature of Staphylococcus saprophyticus among Gram-positive cocci?
– A) Formation of biofilms
– B) Urease production
– C) Colonization of the urinary tract
Correct Answer: C) Colonization of the urinary tract

19. What is the primary mechanism of action of the enzyme catalase produced by Staphylococcus species?
– A) Breakdown of urea
– B) Degradation of lipids
– C) Conversion of hydrogen peroxide to water and oxygen
Correct Answer: C) Conversion of hydrogen peroxide to water and oxygen

20. Which of the following is a common complication associated with Streptococcus pyogenes infections?
– A) Glomerulonephritis
– B) Hepatitis
– C) Tuberculosis
Correct Answer: A) Glomerulonephritis

21. What is the primary distinguishing feature of Neisseria species in terms of cellular arrangement?

  • A) Chains
  • B) Pairs
  • C) Clusters
  • Correct Answer: B) Pairs

22. Which species of Neisseria is associated with causing gonorrhea?

  • A) Neisseria meningitidis
  • B) Neisseria gonorrhoeae
  • C) Neisseria lactamica
  • Correct Answer: B) Neisseria gonorrhoeae

23. Which genus of Gram-negative cocci is associated with infections in immunocompromised individuals and those with underlying medical conditions?

  • A) Neisseria
  • B) Moraxella
  • C) Acinetobacter
  • Correct Answer: C) Acinetobacter

24 What is the primary mode of transmission for Moraxella catarrhalis infections?

  • A) Airborne transmission
  • B) Waterborne transmission
  • C) Person-to-person contact
  • Correct Answer: C) Person-to-person contact

25. Which Gram-negative cocci species is commonly found as part of the normal flora in the upper respiratory tract?

  • A) Moraxella catarrhalis
  • B) Neisseria meningitidis
  • C) Kingella kingae
  • Correct Answer: A) Moraxella catarrhalis

26. Which of the following is a characteristic feature of Acinetobacter species regarding their environmental persistence?

  • A) Strict anaerobes
  • B) Resistant to desiccation
  • C) Sensitive to sunlight
  • Correct Answer: B) Resistant to desiccation

27. Kingella kingae is known for causing infections primarily in which age group?

  • A) Neonates
  • B) Adolescents
  • C) Elderly individuals
  • Correct Answer: B) Adolescents

28. Which Gram-negative cocci species is associated with endocarditis and infections in individuals with pre-existing heart conditions?
– A) Neisseria gonorrhoeae
– B) Kingella kingae
– C) Haemophilus influenzae
Correct Answer: B) Kingella kingae

29. What is a notable feature of the colonies of Moraxella catarrhalis on culture media?
– A) Non-motile
– B) Mucoid appearance
– C) Chocolate agar requirement
Correct Answer: C) Chocolate agar requirement

30. Which Gram-negative cocci species is associated with causing respiratory infections in patients with chronic obstructive pulmonary disease (COPD)?
– A) Neisseria gonorrhoeae
– B) Moraxella catarrhalis
– C) Acinetobacter baumannii
Correct Answer: B) Moraxella catarrhalis

31. Which species of Neisseria is commonly found as part of the normal flora in the nasopharynx?
– A) Neisseria gonorrhoeae
– B) Neisseria meningitidis
– C) Neisseria lactamica
Correct Answer: C) Neisseria lactamica

32. Which genus of Gram-negative cocci is often associated with respiratory tract infections in pediatric patients?
– A) Moraxella
– B) Neisseria
– C) Kingella
Correct Answer: C) Kingella

33. What is the primary route of transmission for Neisseria gonorrhoeae infections?
– A) Airborne transmission
– B) Sexual transmission
– C) Fecal-oral transmission
Correct Answer: B) Sexual transmission

34. Which of the following is a characteristic feature of Neisseria gonorrhoeae on Thayer-Martin agar?
– A) Gamma-hemolysis
– B) Alpha-hemolysis
– C) Beta-hemolysis
Correct Answer: C) Beta-hemolysis

35. What type of hemolysis is typically associated with Neisseria species on blood agar?
– A) Beta-hemolysis
– B) Alpha-hemolysis
– C) Gamma-hemolysis
Correct Answer: B) Alpha-hemolysis

36. Which Gram-negative cocci species is commonly found in the oropharynx and is a common cause of otitis media in children?
– A) Moraxella catarrhalis
– B) Neisseria gonorrhoeae
– C) Haemophilus influenzae
Correct Answer: C) Haemophilus influenzae

37. What is a common characteristic of Acinetobacter baumannii regarding antibiotic resistance?
– A) Sensitive to most antibiotics
– B) Intrinsic resistance to beta-lactam antibiotics
– C) Strictly anaerobic
Correct Answer: B) Intrinsic resistance to beta-lactam antibiotics

38. Which Gram-negative cocci species is often associated with infections in the elderly, particularly those with underlying health conditions?
– A) Acinetobacter baumannii
– B) Neisseria meningitidis
– C) Moraxella catarrhalis
Correct Answer: A) Acinetobacter baumannii

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