Bact metabolism

Question 1

Obligate (strict) aerobes

Answer 1

-grow in presence of oxygen only
-only O2 respiration (e.g. no fermentation or anaerobic respiration)
Examples:
Mycobacterium tuberculosis
Haemophilus influenzae

Question 2

Facultative anaerobes

Answer 2

can use aerobic respiration and fermentation/anaerobic respiration
include most pathogens
Examples:
Escherichia coli (O2 respiration and ferments)
Staphylococcus aureus (O2 respiration and ferments)
Pseudomonas aeruginosa (O2 and NO3- respiration)

Question 3

Aerotolerant anaerobes

Answer 3

not killed by oxygen (have or can use exogenic SOD, catalase, etc.)
respire anaerobically or can ferment
do not respire O2
Examples: 
Streptococcus pneumonia
Streptococcus pyogenes

Question 4

Obligate (strict) anaerobes

Answer 4

usually fermentation only
killed by oxygen, because of the lack of enzymes that neutralize superoxide anions and its products
superoxide dismutase (SOD)
catalase 
peroxidase 
Examples:
Clostridium botulinum
Bacteroides fragilis

Question 5

Microaerophilic bacteria

Answer 5

grow 
-low oxygen (below 21%  atmosphere level)
killed 
-high oxygen
Examples: 
Borrelia burgdorferi