Eucaryotic cell organelles, Biology

Eucaryotic Cell Organelles

A eucaryotic cell has excessive foldings of intrace!:u:;ir cembrane as compared to procaryotic cell. The eucaryotic cell has a number of'organelles such as endoplasmic reticulum, Golgi apparatus, nucleus, mitochondria etc. Organelles have the same relation to a cell, as organs have with an organism. The endoplasmic reticulum is a complex system of membranous sacs, chambers, and tubular canals. It is the site for synthesis of proteins. The Golgi apparatus (or complex) which is a stack of flattened sacs sorts out and processes proteins, besides, it helps in secretion. Membranes also enclose lysosomes, the organelles that contain enzymes necessary for degrading foreign materials thereby help in defence mechanisms. Likewise, membranes surround peroxisomes (microbodies) in which highly reactive hydrogen peroxide is synthesised and degraded. Peroxisomes are also the sites where a variety of biochemical reactions cause conversion of lipids into proteins and v+~ ,e-aversa. In plants, the membranes surround large liquid filled vacuoles. The remaining cytoplasm which is not bound by these organelles is referred to as the cytosol.

The extensive intracellular membrane system of a eucaryotic cell is much larger in size than a procaryotic cell. It provides enough surface area for the exchange of materials and other important cellular reactions which take place on the membrane surface.

It is assumed that membranous organelles have been formed by infolding of plasma membrane through a process called endocytosis (Figure shown below). In endocytosis portions of cell membrane along with the contents of the external medium invaginate and pinch off in the form of cytoplasmic vesicles. Exocytosis is just a reverse process.

321_luysosomes.jpg

Posted Date: 12/9/2012 11:51:24 PM | Location : United States







Related Discussions:- Eucaryotic cell organelles, Assignment Help, Ask Question on Eucaryotic cell organelles, Get Answer, Expert's Help, Eucaryotic cell organelles Discussions

Write discussion on Eucaryotic cell organelles
Your posts are moderated
Related Questions
Q How different is the amphibian heart from the fish heart? The fish heart has only two chambers, a ventricle and an atrium, and the blood that comes to it is purely venous.

Q. How are the triglycerides made? Triglycerides, oils or fats, are made of one molecule of glycerol bound to three molecules of fatty acids. Hydroxyls of each one of the three


Staphylococci exist in air, dust, sewage, water, milk and food or on food equipment, environmental surfaces, humans and animals. Humans and animals are the primary reservoirs. Stap

Define Most Probable Number Test (Multiple Tube Fermentation Test)? Presence of coliforms in the water sample can be detected by performing multiple tube fermentation test whic

Q. How is extracellular digestion related to tissue and cellular specialization? A variety of specialized tissues and cells appeared with extracellular digestion to provide enz

a recent topic for my developmental biology assignment

show me the schamatic diagram of chrysomoeba?

Define the Sterilization protocol? Sterilization protocol encompasses the following: 1. Transport of instruments to the sterilization area 2. Cleaning of instruments 3

What is the group of aquatic beings composed of a large number of photosynthetic beings? A huge number of photosynthetic beings are found in the plankton that is in the surface