Question

explain the structure of nucleus????

Answer 1

The nucleus is surrounded by a system of two concentric membranes, called the inner and outer nuclear membranes. The outer nuclear membrane is continuous with the endoplasmic reticulum, so the space between the inner and outer nuclear membranes is directly connected with the lumen of the endoplasmic reticulum 
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Answer 2

structure : - nucleus is a spherical body it has a double layered covering called nuclear membrane it is impermeable to large molecules the nuclear membrane has pores which allows the transfer of material .