Golgi apparatus, Biology

Assignment Help:

GOLGI APPARATUS

Camillo Golgi in 1898 discovered a reticular structure in the cytoplasm of nerve cells with the help of metal impregnation technique using silver nitrate for which he received the Nobel Prize. This structure was named as Golgi apparatus or Golgi complex after him. Golgi complex is located near thecell nucleus.

Golgi complex is structurally similar in both plant and animal cells, but in plant cells it is more evident and is called as dictyosomes which are stack-like or plate-like bodies. Animal cells contain comparatively much smaller number of Golgi apparatus than plant cells.

The Golgi complex consists of (a) stack of flattened sacs or cisternae (b) small rounded transport vesicles (c) larger vacuoles filled with amorphous or granular material.

The cistemae, which are flattened sac like vesicles of Golgi complex, are arranged in parallel series and are separated by a space of 20-30 nm. Cisternae are gently curved so that the Golgi bodies give a bow like appearance (Figure shown below). The convex side facing the endoplasmic reticulum is 'forming' or 'proximal'-face, whereas the concave side oriented towards cell surface is the 'releasing' or 'distal' face of the complex.

2347_golgi apparatus.jpg

 


Small vesicles called transition vesicles are frequently seen lying between rough endoplasmic reticulum and the forming face. It is thought that these vesicles are formed from the ER and migrate to Golgi, where they form new cisternae, which get fused with existing cisternal membrane, and thus the growth of the organelle occurs. New cistemac are formed at the forming face to compensate for the loss of secretory vesicles of the releasing face. The transformation of membrane from one type to another is a step which leads to the formation of a vesicle. The chemical composition of Golgi complex is intermediary between ER and the plasma membrane.


Related Discussions:- Golgi apparatus

Choice of transgenic animal, C h oice of transgenic animal First and ...

C h oice of transgenic animal First and foremost is the selection of animal species in which gene of interest is to be transferred. Whatever is the goal of production of tran

Define freeze concentration, Define Freeze Concentration? This process ...

Define Freeze Concentration? This process has been known for many years and has been applied commercially to orange juice. However, high processing costs due largely to losses

Define the term - lamellac, Define the term - lamellac The inner membr...

Define the term - lamellac The inner membrane is folded into very closely packed membranes called the lamellac. The lamellae flatten out at regular intervals into structures c

Briefly explain about pickled vegetables, Briefly explain about Pickled veg...

Briefly explain about Pickled vegetables These are produced by spontaneous lactic acid fermentation. Fermentation improves the digestibility and wholesomeness  of the product.

Rk, how many chromosomes in human

how many chromosomes in human

Where can these epithelia are found in the human body, How dissimilar is th...

How dissimilar is the simple cuboidal epithelium from the columnar epithelium? Where can these epithelia are found in the human body? The simple cuboidal epithelium is made of

Explain about the cyclamate - artificial sweeteners, Explain about the cycl...

Explain about the cyclamate - artificial sweeteners? Another sweetener is cyclamate (sodium cyclohexylsulphamate). Have a look at its structure as shown in the figure. It is on

Define characteristics of prebiotics, Define characteristics of prebiotics?...

Define characteristics of prebiotics? Characteristics of prebiotics Are non-digestible dietary/food ingredients Are not hydrolyzed/absorbed in the upper GIT, reach

Explain what is fern allies - lycopophyta, Explain what is Fern Allies - Ly...

Explain what is Fern Allies - Lycopophyta ? Fern allies are those groups of vascular (with conducting vessels) plants that have close ties to the ferns. Sometimes they are refe

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