Question 1

Which of the following best distinguishes innate immunity from adaptive immunity?

Accepted Answer

Innate immunity provides a rapid, non-specific response, while adaptive immunity provides a slower, specific response.

Question 2

Which mechanical barrier is part of the first line of defense against pathogens?

Accepted Answer

Mucociliary escalator in the respiratory tract

Question 3

Antimicrobial peptides protect the host by:

Accepted Answer

Disrupting microbial membranes, leading to cell lysis

Question 4

Which of the following is a chemical barrier in the immune system?

Accepted Answer

Lysozyme in tears and saliva

Question 5

Which leukocyte is primarily responsible for phagocytosis and is the most abundant in blood?

Accepted Answer

Neutrophil

Question 6

Interferons are cytokines that:

Accepted Answer

Induce antiviral states in neighboring cells

Question 7

Iron-binding proteins are important in immunity because they:

Accepted Answer

Limit microbial access to iron, inhibiting growth

Question 8

Which outcome is NOT a result of complement activation?

Accepted Answer

Direct production of antibodies

Question 9

The four cardinal signs of inflammation include all EXCEPT:

Accepted Answer

Increased antibody production

Question 10

Fever is beneficial during infection because it:

Accepted Answer

Enhances the activity of immune cells and inhibits pathogen growth

Question 11

Which statement about antigens is correct?

Accepted Answer

Antigens are molecules that can trigger an immune response due to their immunogenicity.

Question 12

Which T cell type is primarily responsible for killing infected cells?

Accepted Answer

Cytotoxic T (TC) cell

Question 13

Self-tolerance screening in the immune system prevents:

Accepted Answer

Autoimmunity by eliminating self-reactive lymphocytes

Question 14

Which statement best describes the difference between T cells and B cells?

Accepted Answer

B cells mature in the bone marrow, while T cells mature in the thymus.

Question 15

Which equation correctly represents the basic reproduction number ($$R_0) in $$epidemiology?

Accepted Answer

$$R_0$$ = \frac{	ext{rate of infection}}{	ext{rate of recovery}}$$

Question 16

Which of the following is a key reason smallpox eradication was possible?

Accepted Answer

Smallpox virus was stable and only infected humans.

Question 17

Which vaccine category carries the highest risk of causing disease in immunocompromised individuals?

Accepted Answer

Live attenuated vaccines

Question 18

Agglutination reactions are used in blood typing because:

Accepted Answer

They cause visible clumping when antibodies bind to specific blood group antigens.

Question 19

Which statement about ELISA tests is correct?

Accepted Answer

Sandwich ELISA uses two antibodies to capture and detect an antigen.

Question 20

A pathogen with an ID50 of $$10^3$$ and an LD50 of $$10^6 is $$best described as:

Accepted Answer

Moderately infectious and less lethal

Innate and Adaptive Immunity, Host-Microbe Interactions, and Biomedical Applications

Study Guide - Practice Questions