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Obligate aerobes are organisms that thrive in oxygen and require it to live (make ATP for energy). Obligate anaerobes are the exact opposite (require the absolute absense of oxygen to survive, and use fermentation to make ATP). Facultative anaerobes can survive with or without oxygen, but do better with oxygen.

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12y ago
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8y ago

A facultative anaerobic organism is an organism, usually a bacterium, that makes ATP by aerobic respiration if oxygen is present but is also capable of switching to fermentation under anaerobic conditions. - Wikipedia It is a microbe which can use oxygen for respiration but can survive without it by fermentation.

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14y ago

A faculative anaerobe (or faculative bacteria) is an organism that can grow in either the presence or absence of oxygen. It does not require O2 to grow but it does tolerate its presence. An obligate anaerobe is an organism that cannot grow in the presence of oxygen. It neither requires O2 to grow nor does it tolerate it. Obligates anaerobes do not have the necessary emzymes to rid themselves of the toxic oxygen deriviatives.

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8y ago

Obligate aerobes rely exclusively on biochemical pathways that utilize oxygen to produce energy. Therefore in the absence of oxygen, these organisms will not be able to produce enough energy to sustain life. Facultative aerobes utilize oxygen within their biochemical pathways as well, but they have the added benefit of being able to create enough energy to sustain life through the use of other molecules. Oxidative respiration (using oxygen) is by far the most efficient energy-producing mechanism for most organisms, but fermentation (no oxygen) does provide enough energy to maintain for a period of time.

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14y ago

Obligate Anerobes-need air for the cell to function, dont have a choice Hence "obligate-obligatory"

Faculative Anaerobes-can function with the Presence of oyxgen or without it.

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11y ago

aerobes are those which require free molecular oxygen about 21% in air while facultative anaerobes can survive in both conditions presence and absence of oxygen

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Q: What is obligate anaerobe and faculative anaerobe?
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What organism that can live only in an Oxygen-free environment?

Obligate Anaerobe


What is the different between obligate anaerobe and facultative anaerobe?

Facultative anaerobes does not need o2 to grow but can also grow with o2. Obligate anaerobe cannot grow at all in the presence of o2.


What organism is killed by atmospheric oxygen?

obligate anaerobe


Which organism is killed by atmospheric o2?

Obligate anaerobe


Bergey's Manual describes Streptococcus and Escherichia as faculative anaerobes How do the oxygen requirements of these organisms differ...Which one could correctly be called an aerotolerant anaerobe?

Streptococcus is an obligate anaerobe and therefore lacks catalase. However, Streptococcus would be considered an aerotolerant anaerobe because, even though it lacks catalase to break down hydrogen peroxide, it also lacks the cytochrome system that would produce hydrogen peroxide in the first place. Therefore, it is not aerobic, but it is tolerant of aerobic conditions.


When one inoculates a culture into a test tube containing broth and take it out of the incubator the next day and the culture is growing equally throughout the broth?

faculative anaerobe


Is the rhinovirus an obligate anaerobe?

Hello! The rhinovirus, which is known to cause the common cold in humans, is not an obligate anaerobe. Viruses in general really don't mind if the host they are infecting is an anaerobe or not, and they don't have the organelles and specialised proteins and enzymes required for cellular respiration. However, viruses are obligate intracellular parasites, i.e., they have to infect a highly capable host to reproduce many copies of themselves. Hope this response helped you! 😃


Is micrococcus luteus a facultative anaerobe?

No Micrococcus luteus is aerobic organism, Staphylococcus aureus is often mistaken for Micrococcus luteus but its main difference is that it is a Facultative anaerobe


A bacteium would be killed by exposing it to oxygen would be a?

A bacterium to which oxygen is cytotoxic is known as an obligate anaerobe.


What microorganism causes botulism?

Clostridium botulinum. It is a gram-positive rod, obligate anaerobe, and spore-forming.


Is Serratia marcescens an obligate aerobe or a facultative anaerobe?

Members of the genus Serratia are facultative anaerobes. Answer from a professor of microbiology.


What is an anaerobe?

An anaerobe is an organism that thrives in an environment without oxygen. Facultative anaerobes prefer an oxygen-free environment but can survive in the presence of oxygen. Obligate anaerobes are destroyed by oxygen and cannot survive if it is present in their environment.