Question

question 24
a direct immunofluorescence test involves a/an ______.
a precipitation reaction
b known antibody binding to an unknown antigen
c agglutination reaction
d lysis reaction

Explanation:

Direct immunofluorescence uses a known fluorescent-labeled antibody to bind directly to an unknown antigen in a sample, allowing visualization under a fluorescence microscope. Precipitation, agglutination, and lysis reactions are distinct immunoassay types not characteristic of direct immunofluorescence.

Answer:

B. known antibody binding to an unknown antigen