Which test uses radioactive isotopes to label antibodies or antigens in order to detect minute amounts of corresponding antigen or antibody?
A)Ouchterlony double diffusion
B)Western blot
C)immunelectrophoresis
D)radioimmunoassay (RIA)
E)the Quellung test

Question

Quizplus · Accepted Answer

Radioimmunoassay (RIA) uses radioactive isotopes to label antibodies or antigens and is used to detect minute amounts of corresponding antigen or antibody. The other tests listed do not use radioactive isotopes. Ouchterlony double diffusion and immunelectrophoresis involve diffusion or electrophoresis of the sample to separate and visualize antigen-antibody complexes. Western blot is used to detect specific proteins in a sample. The Quellung test is used to identify encapsulated bacteria.

Which Test Uses Radioactive Isotopes to Label Antibodies or Antigens