Mitochondria, Biology

Mitochondria

Mitochondria are commonly known as the "power house" of cells. These are the distinct organelles of all eucaryotic cells, plants, fungi and some protists. In the cell, mitochondria are the sites of aerobic respiration. They are enclosed by a double membrane. The inner membrane is thrown into folds which are called as 'cristae'. Oxidative enzymes are located on these cristae. Mitochondria contain circular and naked DNA. They reproduce by fission, like bacteria. In the absence of mitochondria, eucaryotic cells would have to respire anaerobically and they will have to depend on an inefficient process, like glycolysis for their energy needs. It is interesting that mitochondria resemble an aerobic and non-phbtosynthetic bacterium like Paracoccus. In fact, in one of the eucarjotes like Pleomp pcllustris, there are no mitochondria. In this organism, in place of mitochondria there are serobic bacteria which help the organism in respiration. The ass~ciationo f bacteria with the organism shows a kind of symbiotic (mutual advantage) relationship, wherein bacteria help organism in respiration and in turn bacteria are benefitted by living at the expense of dK organism permanently. This relationship suggests that mitochondria are procaryotes which have entered the "eucaryotic" cell as endosymbionts, i.e.. they have association inside the cell evenbefore the entry of chloroplasts in the cell, In other words, we can say that mitochondria have evolved earlier than the chloroplasts.

Posted Date: 12/10/2012 12:00:49 AM | Location : United States







Related Discussions:- Mitochondria, Assignment Help, Ask Question on Mitochondria, Get Answer, Expert's Help, Mitochondria Discussions

Write discussion on Mitochondria
Your posts are moderated
Related Questions
Q. Which chemical elements are involved to form most of living biological matter? Ans The chemical elements that form most of the molecules of living beings are carbon (C)

Coelenterata – General characters and classification.

Explain the Atmospheric Dispersion Modeling 1. Dispersion model is a mathematical description of the meteorological transport and dispersion process that is quantified in terms

What name is given to the population of genetically identical offspring which result from a process of asexual (vegetative) reproduction?   The population of genetically id

how trematodes/nematodes adapt to their parasitic mode of feeding

Which cell count is likely to be elevated when an individual has an allergy or parasitic worms? a) Red blood cells b) Erythrocyte c) Eosinophil (pron: e-o-sin-o-fill)

Procedure of Hormone Act All plant hormones show extraordinary varied complex effects in controlling plant growth and development, Extrapolation from how an animal hormone wor

Differential reinforcement of low response rate (DRL) This is used to encourage low rates of responding. Example: "If you ask me for a potato chip no more than once every 10 mi

Pollination Many flowering plants rely on animals such as bees, butterflies, moths, wasps, beetles, birds, and bats for pollination to produce fruit. Thirty percent of our food

Bronchiectasis: Bronchiectasis literally means abnormal dilation of bronchi. It is a chronic  inflammatory condition which is characterised  by permanent dilation of bronchi a