Q: Which equation best represents the process of antibody-mediated agglutination?

$$\text{Antibody} + \text{Antigen} \rightarrow \text{Antigen-Antibody Complexes (Clumps)}$$

Q: A cytotoxic T cell destroys a virus-infected cell by releasing perforin and granzymes. Which equation best represents this mechanism?

$$\text{Cytotoxic T Cell} \xrightarrow{\text{Perforin, Granzymes}} \text{Target Cell Apoptosis}$$

Question 1

Which of the following best describes the difference between the primary and secondary immune responses?

Accepted Answer

The secondary response is faster, longer-lasting, and more effective due to memory B cells.

Question 2

A patient receives an injection of antibodies against rabies after being bitten by a potentially rabid animal. Which type of immunity is this an example of?

Accepted Answer

Passive artificial immunity

Question 3

Which antibody class is most effective at activating complement and is the first to be produced during a primary immune response?

Accepted Answer

IgM

Question 4

Antibodies can neutralize pathogens by binding to them and preventing their attachment to host cells. Which defensive mechanism does this describe?

Accepted Answer

Neutralization

Question 5

Which of the following is TRUE regarding the activation of cytotoxic T cells?

Accepted Answer

They are activated by binding to Class I MHC proteins presenting endogenous antigens.

Question 6

A helper T cell is derived from which type of precursor cell, and what is its main function?

Accepted Answer

CD4 cell; coordinates immune responses by activating B and cytotoxic T cells

Question 7

Which of the following best describes the two-step process required for T cell activation?

Accepted Answer

Double recognition (binding to MHC and antigen) followed by co-stimulation (binding to a co-stimulatory signal on the APC)

Question 8

Which equation best represents the process of antibody-mediated agglutination?

Accepted Answer

$$	ext{Antibody} + 	ext{Antigen} ightarrow 	ext{Antigen-Antibody Complexes (Clumps)}$$

Question 9

Which of the following cells are involved in immune surveillance and can detect cells lacking normal MHC I proteins?

Accepted Answer

Natural Killer (NK) cells

Question 10

A patient with an autoimmune disorder is found to have a deficiency in regulatory T cells. What is the most likely consequence of this deficiency?

Accepted Answer

Uncontrolled activation of immune cells leading to self-tissue damage

Question 11

Which of the following best describes the role of cytokines such as interleukins and interferons in the immune response?

Accepted Answer

They are signaling molecules that regulate the activity and communication of immune cells.

Question 12

Which type of antigen is presented by Class II MHC proteins, and which cell type is activated as a result?

Accepted Answer

Exogenous antigen; helper T cell

Question 13

Which antibody class is most abundant in body secretions such as saliva and tears, and provides protection at mucosal surfaces?

Accepted Answer

IgA

Question 14

A cytotoxic T cell destroys a virus-infected cell by releasing perforin and granzymes. Which equation best represents this mechanism?

Accepted Answer

$$	ext{Cytotoxic T Cell} \xrightarrow{	ext{Perforin, Granzymes}} 	ext{Target Cell Apoptosis}$$

Question 15

Which of the following is a key difference between Class I and Class II MHC proteins?

Accepted Answer

Class I MHC proteins present endogenous antigens to CD8 cells, while Class II present exogenous antigens to CD4 cells.

Question 16

Which of the following best explains why T cell activation requires both double recognition and co-stimulation?

Accepted Answer

To prevent accidental activation and ensure the immune response is specific to foreign antigens.

Question 17

Which of the following is NOT a mechanism used by antibodies to defend against pathogens?

Accepted Answer

Direct cell lysis

Question 18

A person is exposed to chickenpox and develops immunity after recovering. Which type of immunity is this?

Accepted Answer

Active natural immunity

Question 19

Helper T cells play a central role in the immune response by:

Accepted Answer

Activating both B cells and cytotoxic T cells

Question 20

Which of the following best describes the process of precipitation as a defensive mechanism of antibodies?

Accepted Answer

Antibodies bind to soluble antigens, causing them to become insoluble and precipitate out of solution.

Immunology: Humoral and Cellular Immune Responses

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