LIST OF QUESTIONS 
205 
15. How are bacteria studied? What are the most 
commonly used stains? What is Gram’s method of stain¬ 
ing? 
16. Name ten Gram-negative and ten Gram-positive 
bacteria. 
17. What is a culture medium? What is an “ordi¬ 
nary” medium and what is an “enriched” medium. Name 
three of each, stating for what organism they may be 
used. 
18. What is a “hanging drop” preparation and what 
is it used for? 
19. What are some of the usual bacteriologic exam¬ 
inations? What is examined and for what infection? 
20. Name three anaerobes and explain how they may 
be cultivated. 
21. What is infection? Immunity? Its varieties? 
22. What is necessary for an infection? What is viru¬ 
lence ? Antigen ? Antibody ? 
23. What is Ehrlich’s theory of immunity? Metchni- 
koff’s? 
24. How' do bacteria produce an infection ? What is 
exotoxin, endotoxin, antitoxin? Blood serum? 
25. What is a vaccine? In connection with what dis¬ 
eases is it used? How is it prepared? 
26. What is an amboceptor? Agglutinin? Precipitin? 
Bacteriolysin ? Hemolysin? Hemolysis? Phagocytosis? 
Opsonin? Leucocytosis? Complement? Weigert’s law? 
27. How is antitoxin serum prepared? In what dis¬ 
eases is it used? Widal test? 
28. What is a Wassermann test? Anaphylaxis? 
29. For what is blood most often examined? Sputum? 
Urine ? 
30. What diseases are produced by staphylococci and 
streptococci? How do they differ from each other mor- 
