$$ \text{Antibody Titer} = T_1$ \cdot e$$^{k(t-t_1)}$$ $$

$$ \text{Antibody Concentration} = C_0$ \cdot e$$^{kt}$$ $$

Question 1

Which of the following best describes the principle of 'specificity' in adaptive immunity?

Accepted Answer

Adaptive immunity targets a single, unique antigen with a focused response.

Question 2

During lymphocyte development, what is the primary purpose of clonal deletion?

Accepted Answer

To destroy clones that react to self-antigens, preventing autoimmunity.

Question 3

Which of the following is NOT a characteristic of a 'good' immunogen?

Accepted Answer

Highly repetitious structure

Question 4

A patient receives antibodies from another person to treat a disease. Which type of immunity is this?

Accepted Answer

Artificial passive immunity

Question 5

Which cell surface marker is essential for T helper cells to recognize antigens presented by antigen-presenting cells?

Accepted Answer

CD4

Question 6

What is the main function of cytotoxic T cells in the immune response?

Accepted Answer

Destruction of infected or abnormal host cells

Question 7

Which equation best represents the relationship between antibody titer and time during a secondary immune response?

Accepted Answer

$$ 	ext{Antibody Titer} = T_1$ \cdot e$$^{k(t-t_1)}$$ $$

Question 8

Which of the following statements about MHC molecules is correct?

Accepted Answer

MHC class I molecules are found on all nucleated cells, while MHC class II molecules are found on antigen-presenting cells.

Question 9

Which of the following is an example of a T-cell-independent antigen?

Accepted Answer

Polysaccharide from Streptococcus pneumoniae capsule

Question 10

What is the primary role of the Fc region of an antibody?

Accepted Answer

Facilitating opsonization and binding to cell receptors

Question 11

Which immunoglobulin is most prevalent in serum and is responsible for long-term immunity?

Accepted Answer

IgG

Question 12

A vaccine that uses a harmless virus to deliver DNA coding for a microbial surface protein is an example of which type?

Accepted Answer

Viral vector vaccine

Question 13

Which of the following best explains why memory cells are important in adaptive immunity?

Accepted Answer

They ensure rapid and robust response upon re-exposure to the same antigen.

Question 14

Which process generates the diversity of antigen receptors on B and T cells?

Accepted Answer

Gene segment rearrangement

Question 15

Which of the following is NOT a function of antibodies?

Accepted Answer

Direct killing of infected host cells

Question 16

Which equation describes the exponential increase in antibody concentration during the secondary immune response?

Accepted Answer

$$ 	ext{Antibody Concentration} = C_0$ \cdot e$$^{kt}$$ $$

Question 17

Which of the following is a characteristic of adaptive immunity that prevents reaction against self-antigens?

Accepted Answer

Tolerance

Question 18

Which cell type is NOT considered an antigen-presenting cell (APC)?

Accepted Answer

T helper cell

Question 19

Which of the following is a property of superantigens?

Accepted Answer

They stimulate T cells at a rate 100 times greater than ordinary antigens.

Question 20

Which of the following is a requirement for a substance to be perceived as an antigen by the immune system?

Accepted Answer

It must be foreign, have proper shape, size, and accessibility.

Adaptive Immunity and Immunization: The Third Line of Host Defense

Study Guide - Practice Questions