In a direct fluorescent antibody test, which of the following would we most likely be looking for using a fluorescently-labeled mab?
bacteria in a patient sample
bacteria isolated from a patient and grown on agar plates
antiserum from a patient smeared onto a glass slide
antiserum from a patient that had bound to antigen-coated beads

bacteria in a patient sample

Explanation:

Direct fluorescent antibody tests ( DFA test ) -

In the DFA test , fluorescently labeled mAb is used to bind and to illuminate the target antigen . This tests are use for the quick diagnosis of bacterial disease .

For example , fluorescence - labeled antibodies against the Streptococcus pyogenes is used for the diagnosis of the strep throat from a throat swab .

enzyme active site and substrate specificity

enzymes bind with chemical reactants called substrates. there may be one or more substrates for each type of enzyme, depending on the particular chemical reaction. in some reactions, a single-reactant substrate is broken down into multiple products