Question 1

Which of the following best describes the mechanism by which Salmonella enterica causes disease in humans?

Accepted Answer

It rapidly multiplies, crowding out and killing healthy body cells.

Question 2

A patient presents with symptoms of malaria after traveling to a tropical region. Which type of pathogen is responsible for this disease, and how is it most commonly transmitted?

Accepted Answer

Protozoan; transmitted by mosquito vector

Question 3

Which of the following is NOT a property of innate immunity?

Accepted Answer

Highly specific recognition of antigens

Question 4

A person develops a skin rash after touching poison ivy. Which type of disease is this, and what is the most likely mechanism?

Accepted Answer

Noninfectious disease; allergic reaction to an environmental antigen

Question 5

Which immune cell is responsible for producing antibodies and is involved in humoral immunity?

Accepted Answer

B-lymphocyte

Question 6

Which of the following equations best represents the relationship between antibody concentration and time during a primary immune response?

Accepted Answer

$$A(t) = A_{max} \frac{t}{t_{peak}}$$ for $$0 \leq t \leq t_{peak}$$

Question 7

Which of the following best explains why antibiotics are ineffective against viral infections?

Accepted Answer

Viruses are non-living and lack cellular structures targeted by antibiotics.

Question 8

A newborn receives antibodies from its mother through breast milk. What type of immunity is this, and how long does it typically last?

Accepted Answer

Acquired passive immunity; lasts weeks to months

Question 9

Which of the following is a function of IgA antibodies?

Accepted Answer

Protects body against ingested and inhaled pathogens

Question 10

A patient with HIV/AIDS is more susceptible to infections. Which best explains this increased vulnerability?

Accepted Answer

HIV damages the immune system, decreasing the body's ability to fight invaders.

Question 11

Which of the following best describes the role of helper T cells in the adaptive immune response?

Accepted Answer

They activate B cells and other T cells by releasing cytokines.

Question 12

Which equation best models the exponential increase in cytotoxic T cells during clonal selection?

Accepted Answer

$$N(t) = N_0$ e$$^{rt}$$

Question 13

Which of the following is a mechanical barrier that forms part of the first line of defense against pathogens?

Accepted Answer

Skin

Question 14

Which immune cell is most likely to be involved in the destruction of cancerous cells lacking MHC-1 antigens?

Accepted Answer

Natural Killer (NK) cell

Question 15

Which of the following best describes the process of phagocytosis?

Accepted Answer

A cell engulfs a particle and digests it.

Question 16

Which of the following pathogens can be treated with antibiotics?

Accepted Answer

Salmonella enterica

Question 17

A person receives a vaccine containing a weakened pathogen. Which type of immunity is being stimulated?

Accepted Answer

Artificial active immunity

Question 18

Which of the following best explains why memory B cells are important in the secondary immune response?

Accepted Answer

They rapidly proliferate and produce large quantities of antibodies upon re-exposure to the antigen.

Question 19

Which of the following is a characteristic of autoimmune diseases?

Accepted Answer

Immune system cannot distinguish between self and non-self antigens

Question 20

Which equation best represents the rapid increase in antibody concentration during a secondary immune response?

Accepted Answer

$$A(t) = A_0$ e$$^{rt}$$

Pathogens, Disease, and the Immune System: A Comprehensive Study Guide

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