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An obligate aerobe is an organism that requires oxygen to grow. [1] Through cellular respiration , these organisms use oxygen to metabolise substances, like sugars or fats, to obtain energy. [ 1 ] [ 2 ] In this type of respiration, oxygen serves as the terminal electron acceptor for the electron transport chain . [ 1 ]
Aerobic organisms produce superoxide dismutase and catalase to detoxify these products, but obligate anaerobes produce these enzymes in very small quantities, or not at all. [ 1 ] [ 2 ] [ 3 ] [ 5 ] The variability in oxygen tolerance of obligate anaerobes (<0.5 to 8% O 2 ) is thought to reflect the quantity of superoxide dismutase and catalase ...
An aerobic organism or aerobe is an organism that can survive and grow in an oxygenated environment. [1] The ability to exhibit aerobic respiration may yield benefits to the aerobic organism, as aerobic respiration yields more energy than anaerobic respiration. [2] Energy production of the cell involves the synthesis of ATP by an enzyme called ...
An anaerobic organism or anaerobe is any organism that does not require molecular oxygen for growth. It may react negatively or even die if free oxygen is present. In contrast, an aerobic organism (aerobe) is an organism that requires an oxygenated environment. Anaerobes may be unicellular (e.g. protozoans, [1] bacteria [2]) or multicellular. [3]
There are three categories of anaerobes. Where obligate aerobes require oxygen to grow, obligate anaerobes are damaged by oxygen, aerotolerant organisms cannot use oxygen but tolerate its presence, and facultative anaerobes use oxygen if it is present but can grow without it. [citation needed]
Unlike obligate anaerobes, they are not poisoned by oxygen. They can be found evenly spread throughout the test tube. A facultative anaerobic organism is an organism that makes ATP by aerobic respiration if oxygen is present, but is capable of switching to fermentation if oxygen is absent. [1] [2]
Unlike obligate anaerobes however, they are not poisoned by oxygen. They can be found evenly spread throughout the test tube. A microaerophile is a microorganism that requires environments containing lower levels of dioxygen than that are present in the atmosphere (i.e. < 21% O 2 ; typically 2–10% O 2 ) for optimal growth. [ 1 ]
1: Obligate aerobes need oxygen because they cannot ferment or respire anaerobically. They gather at the top of the tube where the oxygen concentration is highest. 2: Obligate anaerobes are poisoned by oxygen, so they gather at the bottom of the tube where the oxygen concentration is lowest.