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 is the brain region responsible for the coordination and equilibrium of the body? In the central nervous system the cerebellum is the main controller of the motor equi

Explain Technical factors influencing food production? Improvement in technology has a significant impact on productivity. Improvements may occur in seed production, fertilizer

Nicotinamide nucleotides These coenzymes are derived from  the vitamin, niacin. They are of two  types, nicotinamide  adenine dinucleotide (NAD')  and nicotinamide adenine dinu

Create a dichotomous key the following organisms, ant, butterfly, fly, beetle, grass hopper, wasp, ladybug, roach and dragonfly.

A glycosidic bond would be present in: Select one: a. acetone. b. methyl-alpha-D-glucose. c. 2-deoxy-beta-D-ribose. d. glucose-6-phosphate. e. fructose-1, 6-bisph

Give three examples of genetic engineering that are intended to improve crop plants. Genetic engineering of crop plants can improve resistance to pests, retard ripening, impro

In one study of a heavily polluted area near Birmingham, England, a researcher observed a frequency of 87% melanic Biston betlularia. Calculate the frequency of the dominant allele

How is hydration control by active pump mechanisms responsible in the corneal hydration? Hydration Control by Active Pump Mechanisms: a) Na/K ATPase pump, which is more acti

Q. Define the Purposes of Counselling? 1. Supporting individuals to take charge of their own life by: Providing information; Facilitating emotional adjustments; and

Mixed Tricuspid Stenosis and Regurgitation:  Rheumatic involvement of the tricuspid valve is often seen in association with involvement of mitral and rarely aortic valve. Isolated