51.  An organism that can exist in both oxygen and oxygen-less environments is a(n)  
A.  Aerobe
B.  Obligate aerobe
C.  Facultative anaerobe
D.  Microaerophile
E.  Obligate anaerobe

52.  An organism that cannot tolerate an oxygen environment is a(n)  
A.  Aerobe
B.  Obligate aerobe
C.  Facultative anaerobe
D.  Microaerophile
E.  Obligate anaerobe

53.  An organism that cannot grow without oxygen is a(n)  
A.  Aerobe
B.  Obligate aerobe
C.  Facultative anaerobe
D.  Microaerophile
E.  Obligate anaerobe

54.  What type of media is used to demonstrate oxygen requirements of microbes?  
A.  Blood agar
B.  Thioglycollate
C.  Sulfite polymyxin sulfadiazine
D.  Sodium chloride
E.  None of the choices is correct

55.  A halophile would grow best in  
A.  Acid pools
B.  Fresh water ponds
C.  Hot geyser springs
D.  Arid, desert soil
E.  Salt lakes

56.  A barophile would grow best in  
A.  Acid pools
B.  Deep oceans
C.  Hot geyser springs
D.  Arid, desert soil
E.  Salt lakes

57.  The E. coli that normally live in the human large intestines and produce vitamin K that the body uses would be best termed a _____ relationship.  
A.  Parasitic
B.  Saprobic
C.  Commensal
D.  Mutualistic
E.  None of the choices are correct

58.  The production of antibiotics is a form of antagonism called  
A.  Symbiosis
B.  Satellitism
C.  Antibiosis
D.  Mutualism
E.  Synergism

59.  When microbes live independently but cooperate and share nutrients, it is called  
A.  Symbiosis
B.  Satellitism
C.  Antibiosis
D.  Mutualism
E.  Synergism

60.  When microbes in close nutritional relationship and one benefits but the other is not harmed, it is called  
A.  Symbiosis
B.  Satellitism
C.  Commensalism
D.  Mutualism
E.  Synergism