Peroxisomes and glyoxysomes, Biology

Assignment Help:

PEROXISOMES AND GLYOXYSOMES

Certain small ovoid  unit membrane bound  sac like  cytoplasmic  organelles, resembling  lysosomes in size  and appearance  were  isolated  from various types of animals  and plant cells  by due Duve 1965 these however differ from  lysosomes in being  formed  by budding  from smooth endoplasmic   reticulum and containing not hydrolysing but mainly certain oxidative enzyme oxidases. D amino  acid oxidase and  urate  oxidase .These  enzyme  catalyse  oxidation  of amino uric and  lactic acids  to synthesize  hydrogen  peroxide (H2O2) and  catalase  enzyme  which  decomposes H2O2 .That  is why these organelles  were  christened peroxisomes  probably these correspond  to microbodies  detected carlier 1954 Rhodin   by electron  microscopy.  Later  it was  found that  some peroxisomal  enzyme are related to the biosynthesis  of certain components  of cellular membranes .In  plant cells  peroxisomes co operate with chloroplasts  in the   process  of photo respiration.

 The number of peroxisomes per cell varies from 70 to100.  How and where  these are formed in the cells is not yet clearly understood. Possibly , these form  as buds from  cytoplasmic  reticulum  but  their  enzyme  are synthesized  by ribosomes   found free in the cytosol peroxisomes have  brief  life  span of 5 to6 days .Hence,  old ones are regularly  dissolved by autophagy and  new  ones are formed.

Glyoxysomes : are organelles similar  to peroxisomes   but contain enzyme  of  glyoxylate cycle  which  is concerned  with conversion  of fats to sugars. These occur in cells of fungi,  some protista  and germinating seeds. 


Related Discussions:- Peroxisomes and glyoxysomes

What is the stage of cellular respiration, What is the stage of cellular re...

What is the stage of cellular respiration during which carbon dioxide is liberated? In aerobic cellular respiration the release of carbon dioxide occurs in the transformation o

Define the enzyme function of vitamin c, Define the Enzyme Function of Vita...

Define the Enzyme Function of Vitamin C? Vitamin C acts as an electron donor for 11 enzymes. Three of those enzymes are found in fungi but not in humans. Of the eight remainin

Changes in animal life during xerosere, Changes in Animal Life during Xeros...

Changes in Animal Life during Xerosere Just like the hydrosere, there occur successive changes in animal life during the xerosere. A few mites are usually found associated wi

Pericardium, The heart is enclosed in a membranous sac called the pericardi...

The heart is enclosed in a membranous sac called the pericardium. It has two layers- the fibrous pericardium which is the outer layer and the serous pericardium that lies inside th

Lumpy skin disease, L u mp y skin disease The disease, reported from...

L u mp y skin disease The disease, reported from Sudan in 1970 and Egypt in 1988, is caused by a member of the Capripox virus. It affects cattle and is restricted to African

Sexual reproduction, SEXUAL REPRODUCTION You must be aware that reproduct...

SEXUAL REPRODUCTION You must be aware that reproduction is one of the distinguishing features of living beings. Reproduction is basically of two types: asexual and sexual. In ase

Opium and morphine, OPIUM - Opium is milky latex obtained by incisin...

OPIUM - Opium is milky latex obtained by incising the unripe capsule of white poppy ( Papave r somniferum family paprarecea) It has eaten or smoke. Generally it

Medical management of chronic renal failure, Medical Management   In ch...

Medical Management   In chronic  renal failure  there  is irreversible renal failure. The goals of medical management are:   To promote maximal  renal  function  To ma

Categories of air pollutants, Categories of Air Pollutants From the ab...

Categories of Air Pollutants From the above list you can see that the air pollutants can be broadly classified into the following two categories: Primary Pollutants

Kidneys participate in the acid-basic equilibrium, Q. How do kidneys partic...

Q. How do kidneys participate in the regulation of the acid-basic equilibrium of the body? How are alkalosis and acidosis respectively corrected by the kidneys? Kidneys can reg

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd