Endoplasmic Reticulum


 
 
Concept Explanation
 

Endoplasmic Reticulum

It is a network of tubules and channels and is involved in the synthesis, storage, and transport of cell products. The endoplasmic reticulum is a network of tube-like structures running through the cytoplasm. Some parts are connected to the nuclear membrane, while others are connected to the cell membrane. It is of two types: rough and smooth endoplasmic reticulum.

  • Rough Endoplasmic Reticulum (RER) : It contains ribosomal substances because of which its surface is rough. The ribosomes are the sites of protein synthesis.
  • Smooth Endoplasmic Reticulum (SER) : it helps to manufacture fats or lipids. Its surface is smooth becuase of absence of ribosomes. 
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    Sample Questions
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    Question : 1

    Which cell organelle plays a crucial role in detoxifying many poisons and drugs in a cell?

    Right Option : C
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    Question : 2

    Which of the following are correct ?

    (a) The function of endoplasmic reticulum gives internal support to the cytoplasm.

    (b) Smooth endoplasmic reticulum helps to manufacture protein . 

    Right Option : A
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    Explanation
    Question : 3

    Which of the following are correct ?

    (a) The endoplasmic reticulum is a network of tube-like structures running through the cytoplasm.

    (b) Rough endoplasmic reticulum helps to manufacture fats or lipids. Its surface is smooth because of absence of ribosomes. 

    (c) Endoplasmic reticulum increases the surface area of the cytoplasm for various metabolic activities of the cell.

    Right Option : C
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    Explanation
     
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