Mitochondria, Biology


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
Explain about the Diabetes mellitus? You are aware that diabetes may be diagnosed as an exaggerated response in blood glucose concentration following ingestion of a fixed amou

Hypertensive emergencies should be treated within one hour. Hypertensive urgencies may be treated more slowly. The term accelerated malignant hypertension is used when retinal haem

how pollination occurs in Salvia?

Source of Cells for Regeneration It had been considered earlier that interstitial cells constitute a reserve of undifferentiated cells that provide the cellular material for

What should we focus on During pregnancy? Our focus should be strongly on the preventive aspects of nutrition, identify women at-risk, recognize special needs for counseling, a

Embryology This is the study of growth, fertilization, division or differential of the zygote into embryo of early development of living beings before the attainment of structure

Q. Show Nutrition guidelines for prevention of heart disease? Nutrition guidelines for prevention of heart disease as suggested by WHO are highlighted. Details regardin

List the four basic points to be kept in mind when advising food exchange. To develop the food exchange list points to keep in mind are: a) Group similar foods in one group.

How are platelets formed? What is the function of platelets? What consequences does the clinical condition known as thrombocytopenia yield? Platelets, also called as thrombocyt

Diagnosis of diabetes mellitus which included history taking, symptoms and signs and various tests which can be done to diagnose a case of diabetes. Diabetes Mellitus (DM) or diabe