Q: Which of the following equations best represents the diversity of antibodies produced by genetic recombination in B cells?

$$N_{antibodies} = N_{V} \times N_{D} \times N_{J}$$

Question 1

Which of the following best describes the process of clonal selection in adaptive immunity?

Accepted Answer

The activation and rapid multiplication of a lymphocyte clone specific to an encountered antigen

Question 2

A patient receives a vaccine containing inactivated viral particles. Which type of immunity is primarily being stimulated?

Accepted Answer

Artificial active immunity

Question 3

Which of the following statements about Major Histocompatibility Complex (MHC) molecules is correct?

Accepted Answer

MHC class I molecules display self and foreign antigens on all nucleated cells

Question 4

A newborn receives antibodies from its mother through breast milk. This is an example of:

Accepted Answer

Natural passive immunity

Question 5

Which of the following best explains why glycogen, despite its large molecular weight, is not immunogenic?

Accepted Answer

It is highly repetitious in structure, lacking the complexity required for immunogenicity

Question 6

A patient is exposed to a bacterial toxin that acts as a superantigen. What is the most likely immunological consequence?

Accepted Answer

An overwhelming release of cytokines and potential cell death

Question 7

Which of the following is NOT an antigen-presenting cell (APC)?

Accepted Answer

T helper cell

Question 8

A patient with a genetic defect lacks CD8 coreceptors. Which immune function would be most directly impaired?

Accepted Answer

Destruction of virus-infected and cancerous cells by cytotoxic T cells

Question 9

Which immunoglobulin class is most abundant in serum and provides long-term protection after exposure to an antigen?

Accepted Answer

IgG

Question 10

A small molecule, such as penicillin, can trigger an allergic reaction only after binding to a larger carrier protein. What is this small molecule called?

Accepted Answer

Hapten

Question 11

Which of the following best describes the function of the Fc region of an antibody?

Accepted Answer

It binds to receptors on immune cells, mediating processes such as opsonization

Question 12

A patient receives an injection of gamma globulin after exposure to hepatitis A. Which type of immunity is this?

Accepted Answer

Artificial passive immunity

Question 13

Which of the following best explains why T cells require antigen presentation with MHC molecules, while B cells can recognize free antigens?

Accepted Answer

T cell receptors can only bind to linear peptide fragments presented by MHC, while B cell receptors can bind to native antigen structures

Question 14

Which of the following is a key feature of a 'good' immunogen?

Accepted Answer

High degree of foreignness and molecular complexity

Question 15

A patient is given a vaccine that contains a recombinant protein subunit from a virus. Which of the following best describes this type of vaccine?

Accepted Answer

Subunit vaccine

Question 16

Which of the following equations best represents the diversity of antibodies produced by genetic recombination in B cells?

Accepted Answer

$$N_{antibodies} = N_{V} 	imes N_{D} 	imes N_{J}$$

Question 17

Which of the following is a function of regulatory T cells?

Accepted Answer

Suppressing immune responses to prevent overactivation

Question 18

A patient with a deficiency in class II MHC molecules would have the most difficulty with which immune process?

Accepted Answer

Activation of helper T cells by antigen-presenting cells

Question 19

Which of the following best describes the role of adjuvants in vaccines?

Accepted Answer

They enhance the immune response by prolonging antigen retention and facilitating contact with immune cells

Question 20

A patient is exposed to Streptococcus pneumoniae polysaccharide capsule, which triggers a B cell response without T cell help. This is an example of:

Accepted Answer

A T-cell-independent antigen

Specific Immunity: The Third and Final Line of Defense (Adaptive Immunity)

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