Question

Describe the structure of ER. What are its two types?

Answer 1

Explanation:

The structure of Endoplasmic Reticulum:

1. It is an irregular network of double membraned tubules.

2. It is made up of three components:

   i) cisternae - long flattened parallely arranged unbranched tubules.

   ii) vesicles - spherical, found near synthetically active cells.

   iii) tubules - smooth elongated and maybe branched.

Its two types are :

1. Smooth ER - without ribosomes

2. Rough ER - with ribosomes

Answer 2

Endoplasmic Reticulum (ER)

It is a network of membranes. It provides channels for transport of materials in a cell. ER is of two types:

$\sf{\underline{Rough\:ER}}$ : This type of ER has a rough apperance as it is studded with ribosomes. It plays a vital role in synthesis of proteins.

$\sf{\underline{Smooth\:ER}}$ : This type of ER does not have ribosomes attached to it; it, therefore, has a smooth appearance. It helps in the synthesis of fats.

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