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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:

If a slide agglutination test is rotated for less than 1 minute as the directions specify, what source of error can occur?

In an immunoassay, serum is added  to a microtiter well coated with specific antibody. After incubation and washing, enzyme-labeled specific antibody is added. This procedure is:

The most efficient type of antibodies in the agglutination reactions are:

To prepare a 1/5 dilution of serum to saline, how much saline would you use for 0.5 mL of serum?

Substances produced in phagocytes that are toxic to microbes, such as reactive oxygen species, nitric oxide, and lysosomal proteases, do not destroy the phagocyte because they act within:

The following results were obtained in a standard two-fold serial dilution of an agglutination technique for antibody detection: Tubes 1 through 5 no agglutination, Tubes 6,7, and 8 showed agglutination, Tube 9 and 10 no agglutination. What do the results in tubes 1 through 5 represent?

Each of the following cells express a TCR except:

The precursor cells to both the CD4+ and CD8+ T cells in the thymus are: