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Which of the following is primarily responsible for the changes seen in the secondary immune response in comparison to the primary response?

One difference between the classical complement pathway and the other two pathways of complement activation is that activation of the classical complement pathway requires:

This statement best describes which of the following techniques?  Patient antigen and labeled antigen is mixed and allowed to react with antibodies bound to a solid phase. The amount of patient antigen present is inversely proportional to the amount of detected label (signal strength).

Which of the following statements is correct, concerning the difference between a heterogeneous and homogeneous enzyme immunoassay?

In competitive binding assays, all of the following statements are true, except:

Which of the following is the best indicator of acute phase reactions (or inflammation)? 

The lattice hypothesis states that an optimal reaction occurs between antigen and antibody when:

The production of antibodies to an exposure to an infectious agent causing illness in a patient is:

Human Leukocyte Antigens (HLA) molecules are of greatest clinical significance as they are part of:

A cell-mediated immunodeficiency is suggested if the patient has: