Oxygen Classification Flashcards

Questions and Answers

What is an Obligate Aerobe?

Require O2 as final electron acceptor (correct)

Able to detoxify toxic forms of oxygen (correct)

Live in atmospheric (20%) oxygen levels (correct)

None of the above

Give an example of an Obligate Aerobe.

Mycobacterium smegmatis, Aspergillus niger, Micrococcus luteus, Pseudomonas aeruginosa, Bacillus megaterium

What characterizes a Microaerophile?

Require O2 as final electron acceptor

Limited ability to detoxify toxic forms of oxygen

Live in low (2-10%) oxygen levels

All of the above (correct)

Provide an example of a Microaerophile.

Saccharomyces cerevisiae Signup and view all the answers

What is true about Facultative organisms?

All of the above Signup and view all the answers

Name a type of organism that is Facultative.

Escherichia coli, Bacillus cereus, Staphylococcus xylosus Signup and view all the answers

Aerotolerant organisms can metabolize using O2.

False Signup and view all the answers

Give an example of an Aerotolerant organism.

Enterococcus faecalis Signup and view all the answers

What defines an Obligate Anaerobe?

All of the above Signup and view all the answers

Provide an example of an Obligate Anaerobe.

Clostridium sporogenes Signup and view all the answers

Study Notes

Oxygen Classification

Obligate Aerobes
- Require oxygen (O2) as the final electron acceptor in respiration.
- Capable of detoxifying toxic oxygen forms.
- Thrive in atmospheric oxygen levels around 20%.
- Examples include Mycobacterium smegmatis, Aspergillus niger, Micrococcus luteus, Pseudomonas aeruginosa, and Bacillus megaterium.
Microaerophiles
- Depend on O2 for respiration, using it as the final electron acceptor.
- Possess a limited capacity to neutralize toxic forms of oxygen.
- Prefer low oxygen levels typically between 2-10%.
- A notable example is Saccharomyces cerevisiae.
Facultative Anaerobes
- Utilize O2 as the final electron acceptor when available but can switch to anaerobic pathways in its absence.
- Able to use alternative electron acceptors or ferment organic materials to generate energy.
- Can detoxify toxic oxygen forms.
- Adaptable to both aerobic and anaerobic environments, though they grow more efficiently in aerobic conditions.
- Examples include Escherichia coli, Bacillus cereus, and Staphylococcus xylosus.
Aerotolerant Anaerobes
- Do not utilize O2 as an electron acceptor; metabolism is strictly anaerobic.
- Can detoxify some toxic forms of oxygen.
- Capable of surviving in both aerobic and anaerobic conditions.
- An example is Enterococcus faecalis.
Obligate Anaerobes
- Never use O2 as the final electron acceptor; strictly anaerobic metabolism.
- Incapable of detoxifying harmful oxygen forms.
- Exist exclusively in anaerobic environments.
- A known example is Clostridium sporogenes.

Description

Test your knowledge on oxygen classifications with these flashcards. Each card provides essential definitions and examples related to obligate aerobes. Perfect for biology students and anyone interested in microbiology.