Use the Information Below as Background for the Following Questions

Use the information below as background for the following questions.
Immunodeficiencies may be genetic in origin. Two examples of these are Bruton's agammaglobulinemia, an X-linked disorder, and DiGeorge syndrome, caused by a deletion from chromosome 22. Bruton's results in underdeveloped B cells, while DiGeorge syndrome results in a missing or seriously underdeveloped thymus.
-Bruton's disorder might occur because of which of the following molecular problems?

A) failure of heavy chain rearrangement in B cells
B) failure to incorporate CD4 receptors into cell membranes
C) underexpression of the gene for the beta chain of the T cell receptor
D) underexpression of the gene for the CD8 receptor molecule
E) inability of the bone marrow cells to interact with MHC molecules

Correct Answer:

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