The Number of Major Histocompatibility Complex (MHC)protein Combinations Possible in a Given

question 40

Multiple Choice

The number of major histocompatibility complex (MHC) protein combinations possible in a given population is enormous.However,an individual in that diverse population has a far more 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 only inherits 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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