$$Titer = \frac{1}{\text{highest dilution showing inhibition}}$$

$$\%\,\text{Hemolysis} = \frac{A_{\text{sample}}}{A_{\text{control}}} \times 100$$

$$\%\,\text{Inhibition} = \left(1 - \frac{A_{\text{sample}}}{A_{\text{control}}}\right) \times 100$$

Question 1

Which of the following best describes the difference between innate and adaptive immunity?

Accepted Answer

Innate immunity provides immediate defense against infection, while adaptive immunity develops more slowly and is specific to particular pathogens.

Question 2

Which of the following is NOT considered a physical factor in the first line of defense against pathogens?

Accepted Answer

Lysozyme

Question 3

A patient is exposed to influenza virus for the first time. Which immune response will be primarily responsible for initial defense?

Accepted Answer

Innate immunity involving physical and chemical barriers

Question 4

Which chemical factor in the second line of defense is responsible for breaking down bacterial cell walls?

Accepted Answer

Lysozyme

Question 5

Which equation correctly represents the calculation of antibody titer in a hemagglutination inhibition test?

Accepted Answer

$$Titer = \frac{1}{	ext{highest dilution showing inhibition}}$$

Question 6

Which of the following cells is primarily responsible for phagocytosis in the innate immune system?

Accepted Answer

Neutrophils

Question 7

A vaccine contains inactivated virus particles. Which type of vaccine is this?

Accepted Answer

Inactivated (killed) vaccine

Question 8

Which of the following best explains the concept of herd immunity?

Accepted Answer

Protection of unvaccinated individuals due to a high proportion of immune individuals in the population

Question 9

Which of the following is a correct statement about primary and secondary immune responses?

Accepted Answer

Secondary response is faster and produces more antibodies than primary response.

Question 10

Which formula represents the calculation of percent hemolysis in a blood sample?

Accepted Answer

$$\%\,	ext{Hemolysis} = \frac{A_{	ext{sample}}}{A_{	ext{control}}} 	imes 100$$

Question 11

Which of the following is a function of cytotoxic T-cells in adaptive immunity?

Accepted Answer

Destruction of virus-infected cells

Question 12

Which type of hypersensitivity involves IgE antibodies and mast cell degranulation?

Accepted Answer

Type I hypersensitivity

Question 13

A patient receives a kidney transplant and is prescribed immunosuppressive drugs. What is the primary purpose of these drugs?

Accepted Answer

To prevent rejection of the transplanted organ by the recipient's immune system

Question 14

Which of the following is a characteristic of autoimmune diseases?

Accepted Answer

The immune system attacks the body's own tissues

Question 15

Which equation correctly represents the calculation of percent inhibition in an ELISA assay?

Accepted Answer

$$\%\,	ext{Inhibition} = \left(1 - \frac{A_{	ext{sample}}}{A_{	ext{control}}}ight) 	imes 100$$

Question 16

Which scientist is credited with developing the first successful vaccine against smallpox?

Accepted Answer

Edward Jenner

Question 17

Which of the following is a tumor-associated antigen that can be targeted in cancer immunotherapy?

Accepted Answer

HER2/neu

Question 18

Which type of hypersensitivity is mediated by immune complexes and can lead to conditions such as serum sickness?

Accepted Answer

Type III hypersensitivity

Question 19

Which of the following best describes the role of memory cells in the immune system?

Accepted Answer

They enable a faster and stronger response upon secondary exposure to the same antigen.

Question 20

Which of the following is a correct statement about the hygiene hypothesis?

Accepted Answer

It proposes that reduced exposure to microbes in early childhood may increase susceptibility to allergies and autoimmune diseases.

Comprehensive Study Notes: Immunity, Immunology, and Immune Disorders

Study Guide - Practice Questions