Question 1

Which of the following is a mechanical innate immune defense associated with the respiratory tract?

Accepted Answer

Mucociliary escalator

Question 2

A patient presents with symptoms of watery diarrhea after consuming contaminated water. Which pathogen is most likely transmitted via the oral-fecal route?

Accepted Answer

Cholera

Question 3

Which term describes a disease that is constantly present at a low level in a population?

Accepted Answer

Endemic

Question 4

Which cell type is responsible for producing antibodies during an adaptive immune response?

Accepted Answer

Plasma cell

Question 5

Which class of antibody is most effective at neutralizing pathogens in mucosal surfaces?

Accepted Answer

IgA

Question 6

Which of the following is a sign of disease rather than a symptom?

Accepted Answer

Elevated white blood cell count

Question 7

Which equation best represents the relationship between pathogen fitness ($$F$$), virulence ($$V$$), and transmission rate ($$T$$)?

Accepted Answer

$$F = V 	imes T$$

Question 8

Which step in phagocytosis involves the fusion of a phagosome with a lysosome?

Accepted Answer

Formation of phagolysosome

Question 9

Which of the following is an alternative method to fulfill Koch's postulates when a pathogen cannot be cultured?

Accepted Answer

Detection of pathogen DNA in diseased tissue using PCR

Question 10

Which immune cell type presents antigens with MHC-II molecules?

Accepted Answer

Dendritic cell

Question 11

Which mechanism allows Staphylococcus aureus to avoid the immune system?

Accepted Answer

Production of protein A to bind antibodies

Question 12

Which term describes the gradual accumulation of mutations in viral antigens, leading to immune escape?

Accepted Answer

Antigenic drift

Question 13

Which of the following best describes the function of regulatory T-cells during an adaptive immune response?

Accepted Answer

Suppressing excessive immune reactions

Question 14

Which cell type is primarily responsible for causing an allergic (Type I hypersensitivity) response?

Accepted Answer

Mast cell

Question 15

Which of the following is a biochemical innate immune defense?

Accepted Answer

Lysozyme in tears

Question 16

Which process allows the immune system to generate a diverse array of antibodies?

Accepted Answer

VDJ recombination

Question 17

Which of the following is NOT a function of the complement pathway?

Accepted Answer

Directly producing antibodies

Question 18

Which transmission route involves indirect contact with contaminated surfaces?

Accepted Answer

Fomite transmission

Question 19

Which cell type is associated with mounting a cell-mediated immune response against an endogenous (intracellular) pathogen?

Accepted Answer

Cytotoxic T cell

Question 20

Which of the following best explains how HIV avoids the immune system?

Accepted Answer

Rapid mutation of envelope proteins

Immunology and Epidemiology: Study Guide for Microbiology Exam #3

Study Guide - Practice Questions

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