| Direction: Q. 26 to 30 |
| Read the following and answer the questions from [26] to [30]. |
| Endoplasmic reticulum is a large network of membrane bound tubes and sheets. It extends from outer nuclear membrane into the cytoplasm. It looks like long tubules round and oblong bags (vesicles). It occurs in three forms, i.e. cisternae, vesicles and tubules. ER is of two types, i.e. Rough Endoplasmic Reticulum (RER) and Smooth |
| Endoplasmic Reticulum (SER). ER is absent in prokaryotic cell, and matured RBCs of mammals. |
| It varies greatly in appearance in different cells, it always forms a network system. It serves as channel for the transport of materials between various regions of the cytoplasm or between the cytoplasm and the nucleus. |
| It also functions as a cytoplasmic framework providing a surface for some of the biochemical activities of the cell. |
A) nature of its membrane
B) shape of its membrane
C) function of its membrane
D) All of the above
Correct Answer: A
Solution :
[a] These include amino acids, sugars, some proteins, etc. Depending on the nature of its membrane, ER is of two types, i.e. rough endoplasmic reticulum and smooth endoplasmic reticulum.
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