The transfer of antibodies in breast milk to an in

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Immune System Questions and Answers Quizlet Questions

Question 1 of 5

The transfer of antibodies in breast milk to an infant is an example of immunity.

A. nonspecific B. passive C. humoral D. active

Correct Answer: B

Rationale: Antibodies from breast milk provide passive immunity, transferred without the infant's immune system activation, unlike active or nonspecific immunity.

Question 2 of 5

Which of the options below best completes the following statement: NK cell cytotoxicity is mediated by.

A. activating signals B. lack of inhibitory signals C. expression of ligands that stimulate 'death' receptors on target cells D. All of the above

Correct Answer: D

Rationale: NK cell cytotoxicity involves activating signals, lack of inhibition (e.g., low MHC), and death receptor ligands (e.g., FasL), making all options correct.

Question 3 of 5

Complete the following sentence. Somatic hypermutation consists of the.

A. recombination of gene segments to generate the gene encoding the heavy or light chain variable regions of the BCR B. introduction of point mutations into the rearranged VL & VH genes in order to increase antigen affinity C. selection process by which stromal cells present self- antigen to B cells in the bone marrow to control autoreactive B cells D. recognition of specific antigen by a BCR which induces B cell activation and clonal expansion

Correct Answer: B

Rationale: Somatic hypermutation introduces mutations in V genes to boost affinity, occurring in germinal centers.

Question 4 of 5

Which of the options below does not describe Î±:Î² T-cell receptor rearrangement:

A. TCR rearrangement is RAG-1 & 2 independent B. Î± chain rearrangement continues until either a productive rearrangement leads to positive selection or the cell dies C. Genes encoding for the Î² chain have D, V and J segments D. The Î± chain has an increased likelihood of rescue because of multiple successive rearrangement events

Correct Answer: A

Rationale: TCR rearrangement requires RAG-1/2, unlike the other accurate descriptions.

Question 5 of 5

Which of the following is used for typing when a patient is being prepared for an organ transplant?

A. MHC class I molecules B. MHC class II molecules C. MHC class III molecules D. All of the above

Correct Answer: D

Rationale: All MHC classes (A, B, C) are typed for transplants due to immune recognition; D is correct.

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The transfer of antibodies in breast milk to an infant is an example of immunity.

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Immune System Questions and Answers Quizlet Questions

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