4. How did Von Behring and Kitasato demonstrate the existence ofantibodies?
A) They showed that serum from immunized rabbits could preventdisease in mice
B) They discovered antibodies in mucosal surfaces
C) They synthesized antibodies in serum and tissue fluids
D) They proved the physical presence of antibodies usingcrystallography

5. What term was used by Tizzoni and Cattani to describe the unknownsubstance in serum that provided protection?
A) Immunoglobulin
B) Cryoglobulin
C) Antibody
D) Antitoxin

6. Which enzyme was used by Porter to digest rabbit immunoglobulinG?
A) Chymotrypsin
B) Protease
C) Trypsin
D) Papain

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