After 2 Years of Hard Work,a Graduate Student Finally Succeeds

Multiple Choice

After 2 years of hard work,a graduate student finally succeeds in creating a gene knockout mouse lacking CD4.The student is particularly careful to keep this mouse line in a microbe-free animal facility because these mice are expected to show:

A) No ability to produce IgM antibodies
B) Impaired ability to produce antibodies and activate macrophages
C) No ability to activate naive class I-restricted T cells
D) Complete absence of cytotoxic T lymphocyte (CTL) responses to viral infections
E) Failure to produce neutrophils