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Nuclear membrane - structure of nucleus, Biology
A OR NUCLEAR MEMBRANE
It is also called Nucleolemma, term given by Erclab & Hertwig.
Karyotheca composed of two unit membranes separated by a 150-300 A° wide perinuclear space. Outer membrame may have 80s ribosomes.E.R. is connected to outer nuclear membrane at several places.
Just beneath inner nuclear membrane, there is a fibrous layer called
. It provides strength to nuclear membrane and also provides attachment site to peripheral heterochromatin.
Nuclear membrane is perforated by nuclear pores of 400 - 1000 Aº diameter with space 1500 Aº . In the oocyte of frog (Xenopus laevis) 30 million nuclear pores are present. Nuclear pores are covered by an octagonal structure composed of eight granular subunits called
Annulus or Bleb
. Anulus and nuclear pore collectively called
These pores regulates transport bet. nucleoplasm and cytoplasm, Small ions like K+, Na+ and Cl- move through nuclear membrane while t-RNA ,r-RNA and m- RNA pass through nuclear pores. Protein
which occur in pore complex regulates the nucleo cytoplasmic traffic .
Posted Date: 10/5/2012 7:57:48 AM | Location : United States
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