When the regions of the endoplasmic reticulum | vedclass

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(C) The endoplasmic reticulum $(ER)$ is classified into two types based on the presence or absence of ribosomes on its surface.$1$. When ribosomes are

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Granular endoplasmic reticulum

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(C) The endoplasmic reticulum $(ER)$ is classified into two types based on the presence or absence of ribosomes on its surface.$1$. When ribosomes are attached to the outer surface of the cisternae,the $ER$ appears rough under an electron microscope and is therefore called Rough Endoplasmic Reticulum $(RER)$ or Granular Endoplasmic Reticulum.$2$. In the absence of ribosomes,the $ER$ appears smooth and is called Smooth Endoplasmic Reticulum $(SER)$ or Agranular Endoplasmic Reticulum.Therefore,the presence of ribosomes on the cisternae characterizes the Granular Endoplasmic Reticulum.

When the regions of the endoplasmic reticulum are studded with ribosomes on the outer surface of the cisternae,it is called:

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