The best evidence supporting the concept of immuno

Question 1 of 5

The best evidence supporting the concept of immunological memory is:

A. The increased numbers of antigen receptors expressed by lymphocytes after primary exposure to an antigen B. The increased levels of cytokines made by lymphocytes after primary exposure to an antigen C. The increased rapidity and magnitude of the secondary response to the same antigen D. The increased swelling of lymph nodes during the secondary response to the same antigen

Correct Answer: C

Rationale: Memory is evidenced by faster, stronger secondary responses ; receptor numbers , cytokines , or swelling are less direct indicators.

Question 2 of 5

Empty MHC class I and MHC class II molecules are rapidly removed from the cell surface. This process prevents:

A. The accumulation of empty MHC molecules on the cell surface which would interfere with T cells recognizing pathogen-derived peptide:MHC complexes B. Pathogens from evading the immune response by inducing peptide release from cell surface MHC molecules C. MHC class I molecules from being internalized into endosomes and binding endosome-derived peptides D. HLA-DM from trafficking to the cell surface with MHC class II

Correct Answer: A

Rationale: Empty MHC removal ensures pathogen peptide presentation; not evasion , endosomal binding , or HLA-DM .

Question 3 of 5

The human retina contains rods and cone which are able to

A. convert the photo power to the chemical power B. absorption of ultraviolet C. convert photo power to electrical form and send action potentials to the brain D. absorption of infrared

Correct Answer: C

Rationale: Rods and cones convert light (photo power) into electrical signals (action potentials) sent to the brain, not chemical power or UV/infrared absorption.

Question 4 of 5

A primary immune response is

A. the immune response elicited by the primary antigen of a disease-causing microorganism B. the immune response elicited by the primary antibodies of a disease-causing microorganism C. the immune response elicited by the first exposure of lymphocytes to a particular antigen D. the immune response elicited by the first exposure of memory cells to a particular antigen

Correct Answer: C

Rationale: The primary immune response occurs upon first antigen exposure, activating lymphocytes, not memory cells (secondary response).

Question 5 of 5

Anaphylactic shock is an example of an

A. autoimmune disease B. immunodeficiency disease C. allergic response D. acquired autoimmune disease

Correct Answer: C

Rationale: Anaphylactic shock is a severe allergic reaction, not autoimmune, immunodeficiency, or acquired autoimmune.

The best evidence supporting the concept of immunological memory is:

Nurselytic

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