Question 1

Which of the following is NOT a function of the upper respiratory tract?

Accepted Answer

Facilitating oxygen and carbon dioxide exchange

Question 2

A patient presents with a sore throat, swollen cervical lymph nodes, and exudate on the tonsils. A rapid strep test is positive. What is the most likely causative agent?

Accepted Answer

Streptococcus pyogenes

Question 3

Which of the following best describes the mechanism by which the mucociliary escalator protects the lower respiratory tract?

Accepted Answer

Cilia sweep mucus and trapped debris upward toward the mouth

Question 4

A 3-year-old child develops a barking cough and respiratory stridor. Which diagnosis is most likely?

Accepted Answer

Croup (laryngotracheobronchitis)

Question 5

Which of the following statements about the normal respiratory microbiome is TRUE?

Accepted Answer

It competes with potential pathogens and can secrete antimicrobial peptides

Question 6

Which of the following is the primary reason antibiotics are NOT effective against the common cold?

Accepted Answer

The common cold is caused by viruses

Question 7

A 6-month-old infant is hospitalized with wheezing, coughing, and fever during the winter. Which pathogen is the most likely cause?

Accepted Answer

Respiratory syncytial virus (RSV)

Question 8

Which of the following best explains why annual influenza vaccination is necessary?

Accepted Answer

Antigenic drift and shift result in new viral strains each year

Question 9

Which virulence factor allows Streptococcus pneumoniae to evade phagocytosis?

Accepted Answer

Polysaccharide capsule

Question 10

A patient with a history of HIV develops a chronic cough, night sweats, and weight loss. Sputum is positive for acid-fast bacilli. What is the most likely diagnosis?

Accepted Answer

Tuberculosis (active TB)

Question 11

Which of the following is a distinguishing feature of Mycoplasma pneumoniae compared to Streptococcus pneumoniae?

Accepted Answer

Lacks a cell wall and is intrinsically resistant to beta-lactam antibiotics

Question 12

Which of the following best describes the transmission of Legionella pneumophila?

Accepted Answer

Inhalation of contaminated aerosols from water systems

Question 13

A patient develops a red, sandpaper-like rash and a 'strawberry' tongue following pharyngitis. Which toxin is responsible for these symptoms?

Accepted Answer

Erythrogenic toxin produced by lysogenized Streptococcus pyogenes

Question 14

Which of the following is a key difference between typical and atypical pneumonia?

Accepted Answer

Typical pneumonia often presents with sudden onset, high fever, and lobar consolidation

Question 15

Which of the following best describes the pathogenesis of Bordetella pertussis?

Accepted Answer

Tracheal cytotoxin damages ciliated cells, impairing the mucociliary escalator

Question 16

Which of the following is TRUE regarding Blastomyces dermatitidis?

Accepted Answer

It is a dimorphic fungus that causes endemic mycoses in the Great Lakes region

Question 17

Which of the following best explains why fungal respiratory infections are becoming more common?

Accepted Answer

Increased numbers of immunocompromised individuals and environmental changes

Question 18

Which of the following is the best prevention strategy for Legionnaires’ disease in a hospital setting?

Accepted Answer

Regular maintenance and disinfection of water systems

Question 19

Which of the following best describes the difference between a viral variant and a viral strain?

Accepted Answer

A variant has genetic mutations; a strain has altered viral functions

Question 20

Which of the following is a major complication of untreated Streptococcus pyogenes pharyngitis?

Accepted Answer

Rheumatic fever due to autoimmune cross-reactivity

Respiratory System Infections: Microbiology Study Guide (Ch. 16)

Study Guide - Practice Questions

Study Guide - Flashcards