Microbodies, Biology

Microbodies

Peroxisomes and glyoxysomes are microbodies formed from ER which superficially resemble the lysosomes. Peroxisomes are spherical bodies limited by a single membrane. The centre of peroxisomes is occupied by a fine granular core called 'nucleoid'.

Peroxisomes contain oxidising enzymes which are synthesised by ribosomes. These enzymes are uric acid oxidase, D-amino acid oxidase, hydroxyl acid oxidase which produce hydrogen peroxide on oxidation, while peroxisomal catalase, the enzyme found in lysosomes, destroys hydrogen peroxide. Since hydrogen peroxide is toxic to the cell, catalase plays a protective role by breaking down hydrogen peroxide. Hence, peroxisomes play an important role in detoxification. In green plants, peroxisomes carry out a process called photorespiration.

Glyoxysomes are a form of peroxisome which contain enzymes like isocitrate lyase. and malate synthetase which are specific to gloxylate cycle. They also have several Krebs cycle enzymes about which you will study later. Glyoxysomes are the essential components of plant cell.

Posted Date: 12/10/2012 3:16:10 AM | Location : United States







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

Write discussion on Microbodies
Your posts are moderated
Related Questions
difference between the respiration occurs in lower and higher organisms


Nucellus - Ovule Enclosed within the integuments lies a homogenous mass of tissue which is termed as the nucellus. This is the tissue in which the female gametophyte differen

Q. What are immunoglobulins? Immunoglobulin is the alternate name given to antibody and Immunoglobulins are complex proteins containing a variable portion and an invariable por

Pullulan Pullulan is a water soluble edible microbial polysaccharide consisting of Maltotriose units (α 1 → 6), as shown in  the figure 2.12. It is produced by yeast  Aureobasi


What is panspermia? The Panspermia is a hypothesis that describes life on earth as not originated from the planet. The thought is that the first living beings that colonized th

Explain Hazard identification Hazard identification   is "the  identification of biological, chemical and physical agents capable of causing adverse health effects and which m

Normal 0 false false false EN-IN X-NONE X-NONE MicrosoftInternetExplorer4

Define Protein Requirement for Cancer Patients? Both the metabolic stress of cancer, as well as, chemotherapy results in increased tissue catabolism. Hypoalbuminemia and anaemi