Question

write the function of endoplasmic reticulum
a)rough endoplasmic reticulum
b) smooth endoplasmic reticulum​

Answer 1

Explanation:

The endoplasmic reticulum can either be smooth or rough, and in general its function is to produce proteins for the rest of the cell to function. The rough endoplasmic reticulum has on it ribosomes, which are small, round organelles whose function it is to make those proteins.

Functions of Rough Endoplasmic Reticulum (RER)

It contains ribophorins for providing attachment to ribosomes.

It bears enzymes in the region of pores for modifying polypeptides synthesised by attached ribosomes, e.g., glycosylation.

It synthesises serum proteins, membrane proteins and a number of other proteins.

Proteins and enzymes synthesised by ribosomes enter the channels of RER both for intracellular use as well as secretion.

It provides enzymes precursors for the formation of lysosomes by Golgi complex.

SER can develop from RER by discarding ribosomes.

Functions of Smooth Endoplasmic Reticulum (SER)

It is responsible for synthesis of fats inside the cells of adipose tissue, formation of sphaerosomes, synthesis of glycogen as well as glycogenolysis in liver cells, synthesis of sterol, etc .

Synthetic products of RER pass on to Golgi complex through SER.

Functions of Golgi bodies

All glandular cells depend upon Golgi complex for concentrating and packaging their products inside a soluble protein coat visible as dark staining under electron microscope.

Golgi complex brings about membrane transformation, that is, converting one type of membrane into other types.

Proteins synthesised by the rough endoplasmic reticulum and lipids synthesised by smooth endoplasmic reticulum reach the cisternae of the Golgi apparatus. Here, they combine with carbohydrates to form glycoproteins and glycolipids.

Answer 2

Answer:

Functions of Rough Endoplasmic Reticulum (RER) :

• It contains ribophorins for providing attachment to ribosomes.
• It bears enzymes in the region of pores for modifying polypeptides synthesised by attached ribosomes, e.g., glycosylation.
• It synthesises serum proteins, membrane proteins and a number of other proteins.
• Proteins and enzymes synthesised by ribosomes enter the channels of RER both for intracellular use as well as secretion.
• It provides enzymes precursors for the formation of lysosomes by Golgi complex.

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Functions of Smooth Endoplasmic Reticulum (SER) :

• It is responsible for synthesis of fats inside the cells of adipose tissue, formation of sphaerosomes, synthesis of glycogen as well as glycogenolysis in liver cells, synthesis of sterol, etc.
• Synthetic products of RER pass on to Golgi complex through SER.

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