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?
2. What is the characteristic arrangement of Staphylococcus bacteria?
3. Which species of Staphylococcus is commonly found on the skin and mucous membranes of humans?
4. Streptococcus pneumoniae is known for causing which respiratory infection?
5. What is the primary distinguishing feature of Enterococcus among Gram-positive cocci?
6. Which group of Streptococcus is commonly associated with causing dental caries?
7. Which Gram-positive cocci species is a major cause of skin infections, including boils and abscesses?
8. What is the primary virulence factor of Staphylococcus aureus?
9. Which bacterium is associated with causing toxic shock syndrome (TSS)?
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?
22. Which species of Neisseria is associated with causing gonorrhea?
23. Which genus of Gram-negative cocci is associated with infections in immunocompromised individuals and those with underlying medical conditions?
24 What is the primary mode of transmission for Moraxella catarrhalis infections?
25. Which Gram-negative cocci species is commonly found as part of the normal flora in the upper respiratory tract?
26. Which of the following is a characteristic feature of Acinetobacter species regarding their environmental persistence?
27. Kingella kingae is known for causing infections primarily in which age group?
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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