1. Which of the following methods is most sensitive for identifying different strains of a microbe?
a. microscopic examination
b. radioimmunoassay
*c. DNA typing
d. agglutination test

2. In agglutination reactions, the antigen is a ______; in precipitation reactions, it is a ________.
a. soluble molecule, whole cell
*b. whole cell, soluble molecule
c. bacterium, virus
d. protein, carbohydrate

3. Which reaction requires complement?
a. hemagglutination
b. precipitation
*c. hemolysis
d. toxin neutralization

4. A patient with a _______ titer of antibiodies to an infectious agent generally has greater protection than a patient with a ________ titer.
*a. high, low
b. low, high
c. negative, positive
d. old, new

5. Direct immunofluorescence tests use a labeled antibody to identify _____.
*a. an unknown microbe
b. an unknown antibody
c. fixed complement
d. agglutinated antigens

6. The Western blot test can be used to identify
a. unknown antibiodies
b. unknown antigens
c. specific DNA
*d. both a and b

7. An example of an in vivo serological test is
a. indirect immunofluorescence
b. radioimmunoassay
*c. tuberculin test
d. complement fixation