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(C) The nuclear envelope consists of two parallel membranes with a space between them called the perinuclear space. The outer membrane is continuous w

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Nucleocytoplasmic exchange of materials

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(C) The nuclear envelope consists of two parallel membranes with a space between them called the perinuclear space. The outer membrane is continuous with the rough endoplasmic reticulum and bears ribosomes on it. At a number of places,the nuclear envelope is interrupted by minute pores,which are formed by the fusion of its two membranes. These nuclear pores are the passages through which movement of $RNA$ and protein molecules takes place in both directions between the nucleus and the cytoplasm. Thus,the nuclear envelope facilitates the nucleocytoplasmic exchange of materials.

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