In cell biology, the nucleus is a membrane enclosed organelle found in eukaryotic cells. It contains most of the cell’s genetic material, organized as multiple long linear DNA molecules in complex with a large variety of proteins, such as histones, to form chromosomes. The genes within these chromosomes are the cell’s nuclear genome. The function of the nucleus is to maintain the integrity of these genes and to control the activities of the cell by regulating gene expression — the nucleus is therefore the control center of the cell. The main structures making up the nucleus are the nuclear envelope, a double membrane that encloses the entire organelle and separates its contents from the cellular cytoplasm, and the nuclear lamina, a meshwork within the nucleus that adds mechanical support, much like the cytoskeleton supports the cell as a whole. Because the nuclear membrane is impermeable to most molecules, nuclear pores are required to allow movement of molecules across the envelope. These pores cross both of the membranes, providing a channel that allows free movement of small molecules and ions. The movement of larger molecules such as proteins is carefully controlled, and requires active transport regulated by carrier proteins. Nuclear transport is crucial to cell function, as movement through the pores is required for both gene expression and chromosomal maintenance.
Although the interior of the nucleus does not contain any membrane-bound subcompartments, its contents are not uniform, and a number of subnuclear bodies exist, made up of unique proteins, RNA molecules, and particular parts of the chromosomes. The best known of these is the nucleolus, which is mainly involved in the assembly of ribosomes. After being produced in the nucleolus, ribosomes are exported to the cytoplasm where they translate mRNA. [x]
O_o
(Source: darwinsfinches)
<3 <3 <3
(Source: fuckyeahchinomoreno, via fuckyesdeftones)
All framed and pretty. #deftonesband #deftones #jermainerogers #fuckwithme #corpuschristi #texas #rocketskates (at Deftones Land)
A photo of Phil, as featured in John Kaplan’s photo essay 21.
Mmmmmmmmmmmmmmmmmfffffffffffff
Virgo Facts
Look at the center of this image for 30sec, then watch Van Gogh’s *Starry Night* come to life
Trippy. ;)
I love living in Boston. Beer tastings. Restaurant Week. Different cultures. varieties of different foods, restaurants, and things to do. Plus, the fact that I get to do more of what I love-Catering-and am getting a lay of the land delivering goods to various different businesses for their functions makes me happy.
It’s purely wonderful what a year, thirty pounds less, and moving 60 miles away from what I see as familiar will do. I needed this growth. I needed to get this opportunity. I needed to have my heart broken and do what I could possibly do to put it back together again. I needed to be lied to and lead on and betrayed because it all added up and made me a BIGGER person.
Everyone I have grown up and graduated with have told me that I don’t look my age. I don’t FEEL in my thirties. What I can say, is I feel GOOD. I feel stronger, wiser, more confident, and more assured that all of this has changed me for the BETTER.
I often pray for the opportunity to see my ex again face to face just to tell him THANK YOU for being the lowlife piece of shit he is. I imagine sitting face to face with him just to let him know that everything he tried to use against me actually worked to my benefit. He hid behind a computer screen for six months while serving this country from Korea to keep the peace and pretended to be everything I had ever wanted. I’ve understood that anyone who does this is lacking something major in the way of character and integrity. People who are satisfied and comfortable in their own skin don’t go around attempting to destroy people. Coming out of the woodwork fifteen years after High School just to prove that we don’t get along….interesting. I can think of better ways to expend my energy, time, and efforts, certainly.
The past year has been a journey, for sure. And here I am living back in Boston. I will not stop here. This is not the final destination.
Interesting.
(via zodiacsociety)