Q: Which equation correctly represents the calculation of antibody titer in a serological test?

$$Titer = \frac{1}{\text{highest dilution showing positive reaction}}$$

Question 1

Which of the following is a feature of innate immunity rather than adaptive immunity?

Accepted Answer

Physical barriers such as skin and mucous membranes

Question 2

Which cell type is primarily responsible for phagocytosis in the innate immune response?

Accepted Answer

Macrophages

Question 3

Upon secondary exposure to an antigen, the IgG titer is typically:

Accepted Answer

Much higher than in the primary response

Question 4

Which of the following best describes the role of complement activation in immunity?

Accepted Answer

It enhances phagocytosis and leads to lysis of pathogens

Question 5

A vaccine made from a killed microorganism to stimulate immunity is called:

Accepted Answer

Inactivated (killed) vaccine

Question 6

Which of the following immune responses is directed toward EXTRACELLULAR antigens?

Accepted Answer

Humoral immunity (antibody production)

Question 7

Which of the following is NOT a benefit of inflammation?

Accepted Answer

Suppression of immune cell recruitment

Question 8

Which equation correctly represents the calculation of antibody titer in a serological test?

Accepted Answer

$$Titer = \frac{1}{	ext{highest dilution showing positive reaction}}$$

Question 9

Which of the following is a distinguishing feature of adaptive immunity compared to innate immunity?

Accepted Answer

Immunological memory

Question 10

Which type of hypersensitivity involves IgE antibodies and mast cell degranulation, leading to symptoms such as allergic rhinitis and anaphylaxis?

Accepted Answer

Type I hypersensitivity

Question 11

Which of the following is the correct order of events in the process of inflammation?

Accepted Answer

Vasodilation → Margination → Diapedesis → Phagocytosis

Question 12

Which of the following is a function of cytotoxic T cells in adaptive immunity?

Accepted Answer

Destruction of virus-infected cells

Question 13

Which of the following best describes the role of B lymphocytes in the immune system?

Accepted Answer

They produce antibodies as plasma cells

Question 14

Which of the following is an example of acquired, passive, and natural immunity?

Accepted Answer

Maternal antibodies transferred to a newborn via breast milk

Question 15

Which of the following serological tests is based on the ability of antibodies to crosslink antigens?

Accepted Answer

Agglutination

Question 16

Which of the following is a correct statement about the difference between humoral and cell-mediated immunity?

Accepted Answer

Humoral immunity involves antibody production, while cell-mediated immunity involves cytotoxic T cells

Question 17

Which of the following is a primary function of cytokines in the immune response?

Accepted Answer

Serving as chemical messengers to regulate immune cell activity

Question 18

Which of the following is true regarding the IgM antibody?

Accepted Answer

It is a pentamer, consisting of 5 antibody molecules

Question 19

Which of the following best explains why the adaptive immune response is slower upon first exposure to a pathogen compared to the innate immune response?

Accepted Answer

Adaptive immunity requires clonal selection and expansion of specific lymphocytes

Question 20

Which of the following is a correct application of the concept of 'margination' in inflammation?

Accepted Answer

It describes the adherence of leukocytes to the endothelium of blood vessels

Innate and Adaptive Immunity: Features, Mechanisms, and Clinical Applications

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