1. What are antibodies?
A) Proteins that activate complement against microbes
B) Proteins that prevent attachment of microbes to mucosal surfaces
C) Proteins that increase the concentration of gamma globulins in serum
D) Globulin proteins that react specifically with antigens

2. What are the three types of globulins present in the blood?
A) Alpha, beta, and epsilon
B) Alpha, beta, and gamma
C) Alpha, kappa, and lambda
D) Alpha, beta, and delta

3. Which type of globulins are antibodies?
A) Alpha
B) Gamma
C) Delta
D) Beta

4. What is the most important function of antibodies?
A) To facilitate phagocytosis by opsonization of microbes
B) To reduce virulence of microbes by neutralizing toxins and viruses
C) To prevent attachment of microbes to mucosal surfaces
D) To confer protection against microbial pathogens