This term is used to describe an antigen with more than one specific epitope:

Which of the following complement proteins is a component of the classical complement pathway?

Electrophoresis is defined as:

Consider a patient with a very high level of serum antibody directed against a viral pathogen; determination of the antibody titer using a precipitation assay produces a negative result with 1/2 and 1/4 dilutions of patient serum, but produces a strong result with 1/8 and 1/26 and higher.  This result is related to antibody excess in the patient serum and is referred to as:

Natural Killer cells are similar to cytotoxic T cells, but how are they different? 

You have performed a titer of an antibody present in serum, which produces agglutination. The last test tube to show agglutination is tube 5, the 1/16 dilution. You would report out a titer of:

The precipitation reaction is a serologic method in which:

Which of the following is a characteristic of the humoral immune response?

Up to the point where C5 is produced in the complement pathway, the pathway can best be described as:

Once a naive T cell enters the interfollicular area of a lymph node, the T cell: