Unit 3: Physical Requirements Flashcards
1
Q
Obligate aerobes require
A
presence of oxygen for final e- acceptor
2
Q
eg of obligate aerobes
A
Bacillus, Mycobacterium tuberculosis, Pseudomonas aeruginosa
3
Q
facultative anaerobes require
A
presence or absence of O2. can switch to fermentation if no O2
4
Q
eg of facultative anaerobes
A
most pathogens. Staphylococcus aureus, Escherichia coli
5
Q
obligate anaerobes require
A
sensitivity to O2
6
Q
preferred length, temp and pH range for majority of human pathogens
A
18-24 hours at 35-37 Celsius pH 7.2-7.6
7
Q
components of ambient air
A
21 O2, 78% nitrogen and 0.03 CO2
8
Q
Microaerophilic
A
grow best in low O2 tension (5-10%) and increased CO2 (8-10%)
9
Q
Capnophiles
A
grow best in CO2 (5-10%)
