NEET MDS

The Power Course

Which of the following is known as "packing and shifting department of protein secretory factory"



Choices

1 ) Lysosomes
2 ) Peroxisomes
3 ) Endoplasmic reticulum
4 ) Golgi complex

Explanation


Golgi complex:

Golgi complex was first described by Camillo Golgi in nerve cells in the year 1897. They are mainly involved in modification, sorting, and package of proteins that are secreted by the cells. Hence they are described as the packing and shipping department of protein secretory factory.

Structure and function of Gogi complex:

This complex is seen in both light and electron microscope. They are not stained with hematoxylin or eosin. Under the electron microscope, the Golgi complex has a convex outer face which is close to rough endoplasmic reticulum that is known as "Forming face" or "Cis-Golgi". There is also a concave inner face called "Maturing face" or "Trans -Golgi".  There are small vesicles known as "transport vesicles" that carry newly synthesized proteins from the rough endoplasmic reticulum to the outer or the forming face of the Golgi. These secretory products then appear at the maturing face of Gogli and are known as "condensing vacuole".  These condensing vacuoles further modified to form "mature secretory vacuoles" of protein secreting cells. These vacuoles finally fuse with the plasma membrane to release the secretory products by exocytosis.

Other functions of the Golgi complex include are:

1. They add oligosaccharides to the proteins in the synthesis of glycoproteins.

2. They also add sulfate groups to the proteoglycans.

3. They play a major role in membrane synthesis, membrane recycling.

4. The proton pump that is present in the Golgi complex helps in the concentration of the secretory granules by causing dehydration.

5. They also modify, sorts, packages and delivers enzymes to lysosomes.

6. The Golgi complex handles the distribution of newly synthesized membrane and membrane-associated proteins.

 


Answer

Golgi complex

Last Modified : 25-Dec-2019

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