The Switch of a B Cell from Producing One Class

question 59

Multiple Choice

The switch of a B cell from producing one class of antibody to another antibody class that is responsive to the same antigen is due to

• A)mutation in the genes of that B cell,induced by exposure to the antigen.
• B)the rearrangement of V region genes in that clone of responsive B cells.
• C)a switch in the kind of antigen-presenting cell that is involved in the immune response.
• D)a patient's reaction to the first kind of antibody made by the plasma cells.
• E)the rearrangement of immunoglobulin heavy-chain C region DNA.

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Definitions:

Average Cost Curve

A graphical representation that shows how the average cost of producing a good varies with the quantity produced, usually U-shaped due to economies and diseconomies of scale.

Joint Production

A process where multiple products are produced together in the same operation, often resulting in by-products.

Economies of Scope

Economies of scope occur when producing a wider variety of goods or services reduces the cost of production due to shared inputs or knowledge.

Scale Economies Index

A measure of the cost advantages that enterprises obtain due to their scale of operation, typically associated with cost per unit of output decreasing with increasing scale.