Dictionary » N » Nuclear envelope

Nuclear envelope

Definition

noun

The double-layered membrane that envelopes the nucleus of a eukaryotic cell, separating the contents of the nucleus from the (cytoplasm).


Supplement

It is made up of two layers, each composed of a lipid bilayer. It is perforated with holes, called nuclear pores, to facilitate and regulate the exchange of materials (for example, proteins and RNA) between the nucleus and the cytoplasm. In between these two membranes is a space called perinuclear space. The outer membrane is continuous with the endoplasmic reticulum. The inner membrane is associated with a network of intermediate filaments called nuclear lamina, which is made of lamin. The lamina acts as a site of attachment for chromosomes. It also acts like a shield for the nucleus.


Synonyms:


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Re: help please 1

... do they mean by granular in this case? - The protein lattice called the nuclear lamina- What do they mean by lattice in this case? - The nuclear pore complexes that perforate the nuclear envelope- What do they mean by perforate in this case? - Peroxisomes- They carry ...

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by Stephen1993
Wed Feb 22, 2012 11:19 pm
 
Forum: Cell Biology
Topic: help please 1
Replies: 9
Views: 7259

Please Help with Homework (fairly easy questions)

... surrounds the contents of the nucleus is the A) plasma membrane. B) nuclear envelope. C) nuclear pore. D) cytosol. B) 11. The smooth endoplasmic reticulum A) is the site ...

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by billyfisher100
Wed Feb 15, 2012 6:46 pm
 
Forum: General Discussion
Topic: Please Help with Homework (fairly easy questions)
Replies: 6
Views: 38018

Please Help with Homework (fairly easy questions)

... surrounds the contents of the nucleus is the A) plasma membrane. B) nuclear envelope. C) nuclear pore. D) cytosol. 11. The smooth endoplasmic reticulum A) is the site ...

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by WishIknewbio
Wed Feb 15, 2012 6:02 pm
 
Forum: General Discussion
Topic: Please Help with Homework (fairly easy questions)
Replies: 6
Views: 38018

2 questions about mitosis. Please Help?

1. Cytokinesis begins in telophase. As the nuclear envelope is forming, the cleavage furrow is forming as well. 2. Metaphase is the longest.

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by aptitude
Sun Oct 30, 2011 11:51 pm
 
Forum: Cell Biology
Topic: 2 questions about mitosis. Please Help?
Replies: 2
Views: 2584

MITOSIS PHASES QUESTION?

... structure of chromosome. They remain as loosely coiled chromatin. The nuclear membrane is still intact to protect the DNA molecules from undergoing ... The chromosomes reach the poles of their respective spindles. Nuclear envelope reform before the chromosomes uncoil. The spindle fibres disintegrate. ...

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by HerrBiologie
Sun Oct 30, 2011 9:16 am
 
Forum: Cell Biology
Topic: MITOSIS PHASES QUESTION?
Replies: 2
Views: 4282
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