Lesson 2.3: Oxygen Requirements Flashcards

1
Q

Oxygen relationships of microorganisms

Obligate Aerobes

A

require oxygen
aerobic respiration
Micrococcus luteus (skin, dust)

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2
Q

Oxygen relationships of microorganisms

Facultative Anaerobes

A

do not require oxygen, but grows better with it

aerobic and anaerobic respiration, fermentation

E.coli

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3
Q

Oxygen relationships of microorganisms

Microaerophilic

A

required but low levels (microoxic conditions)

Aerobic respiration

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4
Q

Oxygen relationships of microorganisms
Anaerobes

A

does not respire oxygen

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5
Q

Oxygen relationships of microorganisms
Aerotolerant

A

tolerate oxygen but do not use it
fermentation

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6
Q

Oxygen relationships of microorganisms

obligate anaerobes

Examples

A

inhibited or killed by oxygen

Clostridium- gram-pos, spore-forming

methanogens

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7
Q

Growth of bacteria on the medium based on their oxygen requirement

A

Obligate aerobes- top
Facultative anaerobes- grow throughout
Microaerophiles - grow near the top
Anaerobes- bottom

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8
Q

Methods of culturing for aerobic

A

shaking flasks or bubbling air

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9
Q

Methods of culturing for strict anaerobes

A

incubation in oxygen-free gas chamber
anoxic glove bags
remove trace oxygen

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