Q: Which of the following equations correctly represents the formation of an antigen-antibody complex?

$$\mathrm{Antigen} + \mathrm{Antibody} \rightarrow \mathrm{Antigen\text{-}Antibody\ Complex}$$

Question 1

Which of the following best describes the role of antibodies in the immune response?

Accepted Answer

Antibodies inactivate and tag antigens for destruction by other immune cells.

Question 2

A patient receives a vaccine containing dead or attenuated pathogens. What type of immunity is being acquired?

Accepted Answer

Artificially acquired active immunity

Question 3

Which class of MHC proteins is displayed by all nucleated cells except red blood cells and is crucial for the activation of cytotoxic T cells?

Accepted Answer

Class I MHC proteins

Question 4

During the primary immune response, what is the sequence of events following the initial encounter with an antigen?

Accepted Answer

Activated B cells proliferate to form a clone, which differentiates into plasma cells and memory B cells.

Question 5

Which of the following is a correct example of naturally acquired passive immunity?

Accepted Answer

Antibodies passed from mother to fetus via placenta

Question 6

A patient is exposed to hepatitis A and receives an injection of gamma globulin. What type of immunity is this?

Accepted Answer

Artificially acquired passive immunity

Question 7

Which population of T cells is responsible for directly killing cells harboring foreign antigens?

Accepted Answer

Cytotoxic T cells (CD8)

Question 8

What is the main function of helper T cells (CD4)?

Accepted Answer

Activate B cells, other T cells, and macrophages

Question 9

Which of the following best explains why apoptosis of activated T cells is beneficial after an immune response?

Accepted Answer

It reduces the risk of hyperplasia and cancer by eliminating cells producing large amounts of inflammatory cytokines.

Question 10

Which of the following is TRUE regarding antigen presentation and T cell activation?

Accepted Answer

Both antigen binding and co-stimulation are required for T cell activation.

Question 11

Which of the following equations correctly represents the formation of an antigen-antibody complex?

Accepted Answer

$$\mathrm{Antigen} + \mathrm{Antibody} ightarrow \mathrm{Antigen	ext{-}Antibody\ Complex}$$

Question 12

Which of the following is NOT a function of antibodies?

Accepted Answer

Directly lysing pathogens

Question 13

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

Accepted Answer

Naturally acquired passive immunity

Question 14

Which of the following best describes the structure of an antibody?

Accepted Answer

It consists of two heavy chains and two light chains, each with variable and constant regions.

Question 15

Which process is necessary for the activation of naive T cells?

Accepted Answer

Both antigen binding and co-stimulation

Question 16

Which of the following is a correct sequence for the secondary immune response?

Accepted Answer

Memory B cells recognize antigen, rapidly produce plasma cells, and secrete antibodies.

Question 17

Which of the following cell types is responsible for moderating the immune response?

Accepted Answer

Regulatory T cells

Question 18

Which of the following statements about memory cells is correct?

Accepted Answer

Memory cells allow for a faster and more robust response upon subsequent exposure to the same antigen.

Question 19

Which of the following best describes the difference between active and passive humoral immunity?

Accepted Answer

Active immunity results from exposure to antigen and production of antibodies, while passive immunity results from receiving antibodies produced by another source.

Question 20

Which of the following is TRUE regarding the role of Class II MHC proteins?

Accepted Answer

They are displayed by antigen-presenting cells and present exogenous antigens to helper T cells.

Adaptive Immunity: Humoral and Cellular Responses part 2 (part 1)

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