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...

Chromosomes X and Y and Sex Determination
Chromosomes X and Y and Sex Determination

This tutorial looks at sex determination via the sex chromosomes, X and Y. Read it to get more info on X and Y chromosom..

takahē
Takahē (Porphyrio hochstetteri)

Meet the colorful takahē, an extremely rare flightless bird. Find out more about its unique features and why they matte..

Ploidy
Polyploidy

Humans are diploid creatures. This means that for every chromosome in the body, there is another one to match it. Howeve..

Biological Cell Defense
Biological Cell Defense

Organisms employ different strategies to boost its defenses against antigens. Humans have an immune system to combat pat..

Schematic diagram of bacterial lactose operon
Gene Action – Operon Hypothesis

Learn how the way genes control and determine every aspect of the body. This lesson uses lac operon as an example. ..

..

Developmental Biology
Developmental Biology

Developmental biology is a biological science that is primarily concerned with how a living thing grows and attains matu..