Question 1

Which of the following structures is NOT part of the upper respiratory system?

Accepted Answer

Alveoli

Question 2

A patient presents with a sore throat, fever, and a grayish membrane in the throat. Which pathogen is most likely responsible for these symptoms?

Accepted Answer

Corynebacterium diphtheriae

Question 3

Which of the following best explains why Mycoplasma pneumoniae is resistant to penicillin?

Accepted Answer

It lacks a cell wall.

Question 4

Which of the following is a major virulence factor of Streptococcus pneumoniae that helps it evade the host immune system?

Accepted Answer

Capsule

Question 5

A child presents with severe ear pain and a bulging eardrum. Which of the following is the most likely diagnosis?

Accepted Answer

Otitis media

Question 6

Which of the following diseases is characterized by the formation of tubercles in the lungs?

Accepted Answer

Tuberculosis

Question 7

Which of the following best describes antigenic shift in influenza viruses?

Accepted Answer

Reassortment of RNA segments leading to new strains

Question 8

A patient with a history of HIV presents with a persistent cough and blood in the sputum. Which diagnostic test would be most appropriate to confirm tuberculosis?

Accepted Answer

Tuberculin skin test and chest X-ray

Question 9

Which of the following is the primary reason why the DTaP vaccine for diphtheria must be boosted every 10 years?

Accepted Answer

Immunity wanes over time.

Question 10

Which of the following is a common complication of untreated streptococcal pharyngitis?

Accepted Answer

Scarlet fever

Question 11

Which of the following best explains why the lower respiratory system is typically free of microorganisms?

Accepted Answer

It contains ciliated mucous membranes and alveolar macrophages.

Question 12

A 17-year-old presents with mild but persistent cough, low fever, and headache. PCR confirms the presence of Mycoplasma pneumoniae. Which antibiotic is most appropriate?

Accepted Answer

Erythromycin

Question 13

Which of the following is the most likely cause of a common cold?

Accepted Answer

Rhinovirus

Question 14

Which of the following is a key feature of the pathogenesis of Bordetella pertussis?

Accepted Answer

Destruction of ciliated cells in the trachea

Question 15

A patient is diagnosed with Legionnaires’ disease. Which of the following is the most likely source of infection?

Accepted Answer

Contaminated water

Question 16

Which of the following best describes the mechanism of action for oseltamivir (Tamiflu) in treating influenza?

Accepted Answer

Inhibits neuraminidase

Question 17

Which of the following is a distinguishing symptom of influenza compared to the common cold?

Accepted Answer

Sudden high fever

Question 18

A 3-year-old child presents with pneumonia, and syncytia are observed in a lung biopsy. Which pathogen is most likely responsible?

Accepted Answer

Respiratory syncytial virus (RSV)

Question 19

Which of the following is the most effective way to prevent the spread of the common cold?

Accepted Answer

Frequent hand antisepsis

Question 20

Which of the following best explains why otitis media is more common in children than adults?

Accepted Answer

Children have a smaller and more horizontal auditory tube.

Microbial Diseases of the Respiratory System: Structure, Pathogenesis, and Clinical Features

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