The Adaptive Immune System Uses Multiple Strategies to Generate Diversity

question 21

Multiple Choice

The adaptive immune system uses multiple strategies to generate diversity in our ability to mount responses to a wide array of infectious microorganisms. These strategies include the generation of diverse repertoires of B-cell and T-cell antigen receptors, as well as polymorphism of MHC genes. The polymorphism of MHC genes differs from the diversity of lymphocyte antigen receptors in that:

• A) It involves DNA rearrangements at multiple gene segments in the MHC locus.
• B) It requires different enzymes than the RAG1/RAG2 recombinase required for antigen receptor rearrangements.
• C) It results in a diverse repertoire of clonally distributed receptors on dendritic cells, rather than on lymphocytes.
• D) It creates diversity between individuals in the population rather than within a single individual.
• E) It does not contribute to the transplant rejection responses that occur after organ transplantation between unrelated individuals.

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Definitions:

Producer Surplus

The difference between what producers are willing to accept for a good or service and what they actually receive, representing their gain.

Producer Surplus

The difference between what producers are willing to accept for a product and the amount they actually receive.

Total Revenue

The overall amount of money generated by a firm from the sale of its goods and services, calculated as the unit price multiplied by the quantity sold.

Total Cost

The sum of the fixed cost and the variable cost of producing a given quantity of output.