The Number of Major Histocompatibility (MHC) Protein Isoforms Possible in a Given

question 35

Multiple Choice

The number of major histocompatibility (MHC) protein isoforms possible in a given human population is enormous. However, each individual has a limited array of MHC molecules because ________.

• A) the MHC proteins are made from several different gene regions that are capable of rearranging in a number of ways
• B) MHC proteins from one individual can only be of class I or class II
• C) each of the MHC genes has a large number of alleles, but each individual inherits only two for each gene
• D) once a B cell has matured in the bone marrow, it is limited to two MHC response categories
• E) once a T cell has matured in the thymus, it can only respond to two MHC categories

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Definitions:

Fixed Costs

Costs that do not change with the level of production or sales, such as rent, salaries, and insurance premiums.

Marginal Cost Curve

A graphical representation that shows how the cost of producing one more unit of a good varies as production volume changes.

Diminishing Returns

A principle stating that as additional units of a variable input are added to a fixed input, the marginal product of the variable input eventually decreases.

Upward-Sloping

Describes a line or curve on a graph that moves higher on the y-axis as it moves to the right on the x-axis, typically used to describe a supply curve in economics.