Dictionary > Obligate anaerobe

Obligate anaerobe

Definition
noun
An anaerobe that does not require oxygen and lives only in anaerobic environment.
Supplement
Exposure to atmospheric levels of oxygen is lethal to obligate anaerobes. It is because they lack the enzymes like superoxide dismutase and catalase that would convert the lethal superoxide formed in their cells due to the presence of oxygen.
Obligate anaerobes may use fermentation or anaerobic respiration. Instead of oxygen, they use sulfate, nitrate, iron, manganese, mercury, or carbon monoxide as electron acceptors for respiration. The energy yield is lower than that in aerobic respiration.
Examples of obligate anaerobes are Bacteroides and Clostridium species.
Word origin: obligate » Latin obligātus (ptp. of obligāre), to bind + anaerobe » an- from Gk., “not, without,” + Greek āero-, from āēr, air.
Compare: obligate aerobe.


You will also like...

An artist depiction of a Precambrian multicellular life form.
The Evolution of Cell Organelles

The nucleus containing the genetic material, DNA, and the mitochondria, well-identified as the "powerhouse of the cell",..

Crossing Over and Genetic Diversity
Inheritance and Probability

Gregor Mendel, an Austrian monk, is most famous in this field for his study of the phenotype of pea plants, including ..

Transpiration
Water in Plants

The movement of molecules (specifically, water and solutes) is vital to the understanding of plant processes. This tuto..

Pollution in Freshwater Ecosystems
Pollution in Freshwater Ecosystems

There are many environmental factors that arise due to the usage of water in one way or another and for every action tha..

kinesin motor proteins transporting molecules across microtubules
Movement of Molecules Across Cell Membranes

Molecules move within the cell or from one cell to another through different strategies. Transport may be in the form of..

human brain structure
The Conscious & Unconscious Nervous System

This tutorial elaborates on how the nervous system works, particularly at the tissue level of the brain. There are three..

Related Articles...

No related articles found

See all Related Topics