Help on this Biology question.?
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The nuclear envelope (also known as the perinuclear envelope, nuclear membrane, nucleolemma or karyotheca) is the double membrane of the nucleus that encloses genetic material in eukaryotic cells. It separates the contents of the nucleus (DNA in particular) from the cytosol. The space between the two membranes that make up the nuclear envelope is called the perinuclear space, and is usually about 20 - 100 nm wide. The outer membrane is continuous with the rough endoplasmic reticulum.\n\nNumerous nuclear pores are present on the nuclear envelope to facilitate and regulate the exchange of materials (for example, proteins and RNA) between the nucleus and the cytoplasm.\n\nThe inner membrane is erected upon the nuclear lamina, a network of intermediate filaments made of lamin, that plays a role in mitosis and meiosis. The type of Lamins present are A, B1, B2, and C.\n\nThe nuclear envelope may also play a role in the disposition of chromatin inside the nucleus. The lamina acts as a site of attachment for chromosomes. The nuclear envelope also holds DNA and RNA.\n\nRetrieved from "http://en.wikipedia.org/wiki/Nuclear_envelope"
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This site can help.\nhttp://www.factmonster.com/ce6/sci/A0861551.html
676046
The interaction between an organism and its enviroment is dynamic. It is impossible to separate the "nature" from the "nurture" because they are intertwined. Unfortunately, many people including scientists are too caught up in this false dichotomy.
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Looked it up on the internet and found the website below.\n\nHope it helps you!
484303
lol  Nice try now go do your own homework.. You can get help here but not just ask for answers.
761452
Here is a great site that thoroughly explains it:\nhttp://www.howstuffworks.com/question524.htm
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This should help.  Next time try google you wont have to wait so long for the answer.
200017
Hope this helps. Links below:
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cell walls give structure.
200893
Check out http://www.science-frontiers.com you may find your answer there...
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this sounds like a homework assignment~ i suggest that noone answer this and have this person DO THEIR OWN WORK!\n\nseriously it isnt that difficult of a question if you look it up and research it on your own
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http://dev.biologists.org/cgi/content/full/130/17/4123?ck=nck
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Look at http://ccnmtl.columbia.edu/projects/biology/lecture8/images/g3poxids.gif
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Go to www.sciencedirect.com or pubmed.\n\nYou may find some answers.
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Too many to list and explain here, without copying and pasting  --and why should I do all your uni work for you? ;-)\n\nI will recommend a couple of good text books through.  Well worth a purchase or just get them on loan from your library...\n\nAlberts et al, Molecular Biology of the Cell\nStryer, Biochemistry\n\nIt's been since I bought mine.  Think I got editions 2 & 7 back in 1996 and I know both have been updated a couple of times since.  These are still a GREAT basic resourse for this sort of question.
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An interesting paper on the subject:\nhttp://www3.interscience.wiley.com/cgi-bin/abstract/108064559/ABSTRACT?CRETRY=1&SRETRY=0
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I'd suggest you look in the front of your textbook.  It will be along the lines of "The principles of biology are. . . ."  Usually when they ask open ended questions like these they don't want a thoughtful and insightful answer like the ones given above but rather, for you to parrot the aforementioned sentence back to them.