Question

7. Differentiate between rough and smooth endoplasmic reticulum. How is
endoplasmic reticulum important for membrane biogenesis?( in short)
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Answer 1

Explanation:

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Answer 2

Answer:-

ROUGH ENDOPLASMIC RETICULUM:••

••It possesses ribosomes attached to its membrane.

••Formed of cisternae and a few tubules.

••It participates in the synthesis of enzymes and proteins.

••It helps in the formation of lysosomes.

••It is internal and connected with the nuclear envelope.

••Ribophorins are present and help ribosomes attach to ER.

••It might develop from the nuclear envelope.

••Provides proteins and lipids for Golgi apparatus.

SMOOTH ENDOPLASMIC RETICULUM:••

••It does not have ribosomes on its membrane.

•• Formed of vesicles and tubules.

••Synthesises glycogen, lipids and steroids.

••Gives rise to Spherosomes/ Oleosomes.

••It is peripheral and may be connected to plasmalemma.

••Devoid of Ribophorins.

••Develops from Rough Endoplasmic Reticulum.

••Provides vesicles for cis-face of Golgi apparatus.

The ribosomes, which are present in all active cells, are the sites of protein synthesis. Endoplasmic reticulum also has ribosomes attached to its surface, proteins are synthesized and transported via vesicles to Golgi apparatus that helps in transporting these proteins to various places. The smooth endoplasmic reticulum helps in manufacturing of fat and lipids which along with proteins help in building the cell membrane or membrane biogenesis. As cell membrane consists of lipids and proteins.