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PART - 1 - Unit III : CH - 8 Cell: The Unit of Life — BIOLOGY STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceBIOLOGYPART - 1 - Unit III : CH - 8 Cell: The Unit of Life4 Marks
Question
What is called endoplasmic reticulum? Write any four differences between smooth endoplasmic reticulum and rough endoplasmic reticulum.
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Answer

Endoplasmic Reticulum : In the cytoplasm of eukaryotic cells, a small tubular reticulum system containing flat, interconnected, sacs is scattered, which is called endoplasmic reticulum.
S.No.Smooth Endoplasmic ReticulumRough Endoplasmic Reticulum
1.Ribosomes are not found on their surface.Whereas ribosomes are found on their surface.
2.It is mostly tubular.It is often found in the form of Cisternae.
3.It is not related to protein synthesis.Whereas it is related to protein synthesis.
4.It is peripheral and can be attached to the plasma membrane.It is found deep in the cytoplasm and is attached to the nuclear envelope.
5.It transmits impulses from outside to inside the cell.It acts as a channel for the transport of proteins and proenzymes.
6.It may originate from the rough endoplasmic reticulum.It may originate from the nuclear envelope.
7.Example : Retinal cells and interstitial cells.Example : Goblet cells and thyroid cells.

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