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Which of the following is a soluble regulator of complement?

In the immunoglobulin molecule, light chains are attached to heavy chains by:

A precipitin method where the antibody is in the gel and the antigen is placed in a well and allowed to diffuse out in a circular pattern, where the square of the diameter of the precipitin ring is plotted on a standard curve is called:

Which of the following sets includes immunoglobulins that are all capable of fixing complement:

A test method that determines whether an antigen or antibody is present, but will not determine the amount present is:

An Ouchterlony double immunodiffusion is performed, crossed lines of precipitation are observed. Which of the following is true?

Which outcome results from improper washing of a tube or well after adding the enzyme-antibody conjugate in an ELISA system?  Assume all steps taken prior to this step were performed properly. 

Mannose-binding protein in the lectin pathway is most similar to which classical pathway component?

Match the appropriate T lymphocyte population with the correct description. 

CD4+ T cells are called helper cells because they help activate other cells; the most important recipients of the CD4+ helper effector function are: