Question 1

Which of the following structures is NOT part of the upper respiratory system and does NOT contribute to its defense mechanisms?

Accepted Answer

Alveoli

Question 2

A patient presents with a sore throat and is diagnosed with pharyngitis. Which of the following virulence factors produced by Streptococcus pyogenes helps it evade phagocytosis?

Accepted Answer

M proteins

Question 3

A child develops a thick, gray membrane in the throat and difficulty breathing. Which vaccine could have prevented this disease, and what is the causative agent?

Accepted Answer

DTaP vaccine; Corynebacterium diphtheriae

Question 4

Why must Corynebacterium diphtheriae be lysogenized to produce its exotoxin?

Accepted Answer

Lysogeny introduces the gene for exotoxin production via a bacteriophage

Question 5

A 5-year-old is diagnosed with otitis media. Which of the following is NOT a common causative agent?

Accepted Answer

Mycobacterium tuberculosis

Question 6

Why are antibiotics generally ineffective in treating the common cold?

Accepted Answer

The common cold is caused by viruses, and antibiotics target bacteria

Question 7

Which of the following best describes the function of the ciliary escalator in the lower respiratory system?

Accepted Answer

It moves particles toward the throat via ciliary action

Question 8

A patient is diagnosed with whooping cough. Which virulence factor of Bordetella pertussis is responsible for damaging ciliated cells in the trachea?

Accepted Answer

Tracheal cytotoxin

Question 9

During the 2001 anthrax attacks in the United States, which new technology could have been used to rapidly detect the presence of anthrax spores?

Accepted Answer

Pro Strips Rapid Screening System

Question 10

Why is vaccination considered a critical component of bioterrorism preparedness?

Accepted Answer

It protects populations from deliberately released pathogens and limits disease spread

Question 11

A patient with HIV develops pneumonia caused by Pneumocystis jirovecii. Why is this infection considered a primary indicator disease for AIDS?

Accepted Answer

It is asymptomatic in immunocompetent individuals but causes severe disease in the immunocompromised

Question 12

Which cell wall component of Mycobacterium tuberculosis is responsible for stimulating a strong inflammatory response in the host?

Accepted Answer

Mycolic acids

Question 13

A patient is diagnosed with tuberculosis. What is the minimum duration of drug therapy required, and why is it so long?

Accepted Answer

$$6$$ months; due to slow growth and dormancy of Mycobacterium tuberculosis

Question 14

SARS-CoV-2 is an RNA virus that mutates frequently. What is the primary reason for its high mutation rate?

Accepted Answer

It lacks efficient proofreading during replication

Question 15

Which of the following best explains the role of cytokines in severe COVID-19 cases?

Accepted Answer

Cytokines are released, causing a cytokine storm that leads to inflammation and lung injury

Question 16

How do mRNA vaccines protect against COVID-19?

Accepted Answer

They deliver mRNA encoding the spike protein, which is produced by host cells to stimulate an immune response

Question 17

Why must the flu vaccine be administered every year?

Accepted Answer

The circulating strains change annually due to antigenic drift and shift

Question 18

Which of the following best describes the difference between antigenic drift and antigenic shift in the influenzavirus?

Accepted Answer

Antigenic drift involves minor changes in HA and NA, while antigenic shift involves major reassortment of RNA segments

Question 19

A farmer cleaning out an old barn develops a respiratory infection. Which pathogen is most likely responsible, and how is it transmitted?

Accepted Answer

Histoplasma capsulatum; airborne conidia in areas with bird or bat droppings

Question 20

Which of the following is a real-world example of bioweapons use before the twentieth century?

Accepted Answer

Smallpox-contaminated blankets used against Native Americans during the French and Indian War

Microbial Infections of the Respiratory System & Bioterrorism: Study Notes

Study Guide - Practice Questions

Study Guide - Flashcards