Q: Which equation best represents the clonal selection and expansion of lymphocytes after antigen exposure?

$$N_{final} = N_{initial} \times 2$$^{n}$$

Question 1

Which of the following best describes the role of Major Histocompatibility Complex (MHC) molecules in adaptive immunity?

Accepted Answer

They are glycoproteins found on all nucleated cells (except red blood cells) that present antigen fragments to T cells, aiding in self-recognition and immune response.

Question 2

A patient receives a vaccine containing mRNA coding for the spike protein of SARS-CoV-2. Which process occurs after the vaccine is administered?

Accepted Answer

The mRNA is translated by human cells to produce the spike protein, which is then recognized as an antigen by the immune system.

Question 3

Which immunoglobulin class is most prevalent in the bloodstream and provides long-term immunity after exposure to a pathogen?

Accepted Answer

IgG

Question 4

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

Accepted Answer

Natural passive immunity

Question 5

Which of the following statements about cytotoxic T cells (CD8+) is correct?

Accepted Answer

They destroy infected host cells by recognizing antigens presented by MHC class I molecules and releasing perforins and granzymes.

Question 6

Which equation best represents the clonal selection and expansion of lymphocytes after antigen exposure?

Accepted Answer

$$N_{final} = N_{initial} 	imes 2$$^{n}$$

Question 7

Which of the following is a function of regulatory T cells (Treg)?

Accepted Answer

They secrete anti-inflammatory cytokines to control the immune response and prevent autoimmunity.

Question 8

A molecule with a molecular weight of 1,500 is introduced into the body. What is the most likely immunological outcome?

Accepted Answer

It will not be recognized as an antigen unless it is attached to a carrier molecule, acting as a hapten.

Question 9

Which of the following best explains why booster shots are sometimes required after initial vaccination?

Accepted Answer

Booster shots are required to maintain long-term immunity by stimulating memory cell production and increasing antibody titers.

Question 10

Which of the following is NOT a requirement for an effective vaccine?

Accepted Answer

It should require numerous doses and frequent boosters.

Question 11

Which type of vaccine preparation involves using only antigenic components of a pathogen, such as proteins or polysaccharides, rather than the whole organism?

Accepted Answer

Subunit vaccine

Question 12

Which of the following best describes the process of opsonization?

Accepted Answer

Coating of pathogens with antibodies to enhance phagocytosis.

Question 13

Which cell type is responsible for presenting antigens to T helper cells using MHC class II molecules?

Accepted Answer

Macrophages, dendritic cells, and B cells

Question 14

Which of the following is a common misconception about vaccines that contributes to vaccine hesitancy?

Accepted Answer

Vaccines can cause the disease they are meant to prevent, such as getting the flu from the flu vaccine.

Question 15

Which equation best represents the rapid increase in antibody concentration during a secondary immune response?

Accepted Answer

$$[Ab]_{secondary} \gg [Ab]_{primary}$$

Question 16

Which of the following statements about natural killer (NK) cells is correct?

Accepted Answer

They attack cancer cells and virus-infected cells in a manner similar to cytotoxic T cells but lack antigen specificity.

Question 17

Which of the following is true regarding the specificity of lymphocyte receptors?

Accepted Answer

Lymphocyte specificity is preprogrammed during development and does not change after exposure.

Question 18

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

Accepted Answer

They are compounds added to vaccines to enhance immunogenicity and prolong antigen retention at the injection site.

Question 19

Which of the following is a correct statement about the difference between antigens and immunogens?

Accepted Answer

Immunogens are highly individual and stimulate adaptive immunity, while antigens may provoke either innate or adaptive responses.

Question 20

Which of the following is a true statement regarding the MMR vaccine and autism?

Accepted Answer

There is no link between the MMR vaccine and autism.

Adaptive Immunity: The Third Line of Defense (Microbiology Study Notes)

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