Eucaryotic cell organelles, Biology

Assignment Help:

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


Related Discussions:- Eucaryotic cell organelles

Define the meaning of behaviour change communication, Meaning of Behaviour ...

Meaning of Behaviour Change Communication Now day's very common term used for giving health education to people and for giving information to bring change in behaviour is Behav

Philum colenterata, What are the economic importance of colenterata

What are the economic importance of colenterata

Simplification and selection of information of consciousness, Q. Simplifica...

Q. Simplification and Selection of information of Consciousness? Simplification and Selection of information: There is much "editing" that goes on in the mind-from the first cu

Role of echocardiography, Echocardiography is a very important tool in diag...

Echocardiography is a very important tool in diagnosis of cardiovascular diseases and is used  virtually in all categories of cardiovascular diseases. There are certain areas where

Inter specific incompatibility, Inter specific Incompatibility This t...

Inter specific Incompatibility This type of incompatibility is characterized by the prevention of fusion of gametes between members of different species. The incompatibility

Explain systemic circulation in human biology, Explain Systemic Circulation...

Explain Systemic Circulation in human biology? In systemic circulation, oxygenated blood is pumped from the left atrium through the bicuspid valve, into the left ventricle, and

Enumerate about the halstead- reitan battery, Enumerate about the Halstead-...

Enumerate about the Halstead- Reitan battery As in the case of the Halstead- Reitan battery, one could present two theoretical bases for the Luria- Nebraska, one revolving arou

Palynofossils (microfossils), Palynofossil s (Microfossils) - Fossils ...

Palynofossil s (Microfossils) - Fossils of planktons, diatoms, unicellular algae (diatoms) and shelled protozoans. (Heliozoans, Radiolarian and Foraminifera). Its finding in s

Which cardiac muscle is microscopically, State two ways in which cardiac mu...

State two ways in which cardiac muscle is microscopically similar to skeleton muscle.

Chemical changes during cleavage, CHEMICAL CHANGES DURING CLEAVAGE - 1....

CHEMICAL CHANGES DURING CLEAVAGE - 1.       Synthesis of DNA occurs. 2.       Synthesis of RNA (rRNA is absent, mRNA & tRNA are synthesized very little amount). 3.

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