What protein inhibits mitosis in a normal cell?
463857
well it depend on the species of animal or plant you're studying. in Mammalian cells, The protein mTOR is a serine/threonine kinase that regulates DNA translation and cell division. the availability of a food source for the cell influences mTOR so that when cells are not able to grow to normal size they will not go through cell division. This is just one of the proteins synthesized during different times of a cell cycle to prevent mitosis from occuring. some disrupt the formation of mitotic spindles, some prohibit the cell from going into prophase or metaphase...others work on chemical receptors and hormones released form the cell. google search it, and I hope this has helped :)
1157421
tetracyclin inhibits translation, i don't think it's able to penetrate eukaryotic cells, because it would inhibit translation in them as well.
1018240
none\n\n\nyou start with one pair of homologous chromosomes in prophase I of meiosis I.  at metaphase I, these homologues line up across the metaphase plate, and at anaphase, they seperate so that one homologue goes to one pole, and the other homologue goes to the other pole.  after cytokinesis at the end of telophase I, you have one homologue in each cell...that homologue then goes through meiosis II, and at metaphase II, that homologue lines up at the metaphase plate with each sister chromatid facing each pole, and the chromosome is "pulled apart".  Anaphase II pulls the sister chromatids to each pole, and cytokinesis splits the one cell into two....two cells, each containing one sister chromatid of a homologous pair. (although in some text books this is refered to as a single homologue)
312511
Mitosis is the process of cell division.  Our cells are constantly dying off.  Mitosis allows living organisms to continue to survive by replacing the dying cells.
984504
Cytokinesis is the process whereby the cytoplasm of a single cell is divided to spawn two daughter cells. It usually initiates during the late stages of mitosis, splitting a binucleate cell in two to ensure that chromosome number is maintained from one generation to the next. One notable exception to the normal process of cytokinesis is oogenesis (the creation of an ovum in the ovarian follicle of the ovary), where the ovum takes almost all the cytoplasm and organelles, leaving very little for the resulting polar bodies, which then die. In plant cells, a dividing structure known as the cell plate forms across the centre of the cytoplasm and a new cell wall forms between the two daughter cells.\nThe big difference between animal and plant cell cytokinesis is that the animal cell develops a cleavage furrow that essentially pinches through the middle of the two new cells that will form two separate new cells.  In plant cells there is a new cell wall that begins to form between the two new forming cells called the cell plate.  This cell plate begins at the center of the two new cells and continues to grow outward towards the existing cell wall, finally dividing the one cell into two.
602078
I do not know alot about them, but I do know that spindle proteins are used in cell division to move the chromatids.\n\nSee http://www.scienceaid.co.uk/celldivision.html for more about cell division and spindle proteins.
984693
There are a few main checkpoints before cell division which you might be thinking of. \n\nBetween G1 and S, in the middle of the S phase, and between G2 and M, all checking to make sure that any damaged DNA is repaired before replication/division.\n\nThere are also checkpoints during mitosis, for example, between metaphase and anaphase to make sure all chromosomes are attached to spindles.
866207
the cell dividing force lol. theres no such force. it's a spontaneous occurence
753973
Mitosis is when a cell divides to create two daughter cells that are identical. Meiosis is the process by which eggs and sperm are created. In meiosis a cell divides and each daughter cell has only half the DNA.
501668
Mitosis is nuclear division plus cytokinesis, and produces two identical daughter cells during prophase, prometaphase, metaphase, anaphase, and telophase. Interphase is often included in discussions of mitosis, but interphase is technically not part of mitosis, but rather encompasses stages G1, S, and G2 of the cell cycle.  \nInterphase & mitosis Interphase \n  \nThe cell is engaged in metabolic activity and performing its prepare for mitosis (the next four phases that lead up to and include nuclear division). Chromosomes are not clearly discerned in the nucleus, although a dark spot called the nucleolus may be visible. The cell may contain a pair of centrioles (or microtubule organizing centers in plants) both of which are organizational sites for microtubules. \n \nProphase \n  \nChromatin in the nucleus begins to condense and becomes visible in the light microscope as chromosomes. The nucleolus disappears. Centrioles begin moving to opposite ends of the cell and fibers extend from the centromeres. Some fibers cross the cell to form the mitotic spindle. \n \nPrometaphase\n  \nThe nuclear membrane dissolves, marking the beginning of prometaphase. Proteins attach to the centromeres creating the kinetochores. Microtubules attach at the kinetochores and the chromosomes begin moving. \n \nMetaphase\n  \nSpindle fibers align the chromosomes along the middle of the cell nucleus. This line is referred to as the metaphase plate. This organization helps to ensure that in the next phase, when the chromosomes are separated, each new nucleus will receive one copy of each chromosome.\n \nAnaphase\n  \nThe paired chromosomes separate at the kinetochores and move to opposite sides of the cell. Motion results from a combination of kinetochore movement along the spindle microtubules and through the physical interaction of polar microtubules. \n \nTelophase \n  \nChromatids arrive at opposite poles of cell, and new membranes form around the daughter nuclei. The chromosomes disperse and are no longer visible under the light microscope. The spindle fibers disperse, and cytokinesis or the partitioning of the cell may also begin during this stage. \n \nCytokinesis\n \nIn animal cells, cytokinesis results when a fiber ring composed of a protein called actin around the center of the cell contracts pinching the cell into two daughter cells, each with one nucleus. In plant cells, the rigid wall requires that a cell plate be synthesized between the two daughter cells.
241204
During *mitosis*, the cytoplasm of a cell and its organelles separate into two new *identical cells*?\n\nI'm not sure what else you're looking for here...
778732
Cell division (think CELL CYCLE) is regulated by an incredibly complicated series of genes/proteins and signaling. But in the simplest terms, cells have genes called "oncogenes" and "tumor supressor genes", of which the former causes cell division, and the latter stops cell division.\n\nIn all cells, both of these kinds of genes are functioning all the time, but are regulated by various pathways (by extracellular signaling, and even factors from within the cell). \n\nAn oncogene we know a lot about is called RAS, and a tumor suppressor we know a lot about is p53. Basically in cancer, and this is just two examples: (1) RAS (an oncogene) activity is unregulated, thus the cell loses control of the cell cycle and divides uncontrollably. (2) p53 activity is lost, and thus we lose "tumor suppressor" function, and the cell divides uncontrollably.\n\nThe problems with cancers are not always these genes themselves, but the pathways that regulate them (regulate their transcription for example). There are many many many different things that can upset these pathways, and thats why cancer is so so difficult to fight/prevent.
852306
Most mitotic cell divisions do result in daughter cells that are equal in size to the parent. During interphase, the cellular material, like cytoplasm, is duplicated as well as the genetic material. This is not the case for meiotic cell divisions, though, which yield cells that are certainly smaller than the parents, about 1/4 the size, and it is not always the case in mitosis, like for example, in the developing blastula.
937352
Check out "mitosis" in a suitable source (Wikipedia, for example).  The process is a bit long to describe here.
80155
In mitosis the nuclear membrane breaks down and the centrosome nucleated mictrotubules can interact with the chromosomes to build the mitotic spindle. The centrosome nucleates and organizes microtubules. It plays a central role in mitosis, and in making cilia and flagella.\n\nInterestingly, centrosomes are not required for the progression of mitosis. When the centrosomes are irradiated by laser, mitosis proceed normally with a morphologically normal spindle. However, acentrosomal cells lack radial arrays of astral microtubules. They are also defective in spindle positioning and cytokinesis. The function of centrosome in this context seemed to ensure the fidelity of cell division, rather than directing it. Cells that have lost their centrosomes arrest in the following cell cycle. It is not yet clear whether this is because the centrosome plays a role in cell cycle progression or whether the arrest is the result of a generic stress response.\n\nWhen the nematode C. elegans egg is fertilized the sperm delivers a pair of centrioles. These centrioles will form the centrosomes which will direct the first cell division of the zygote and this will determine its polarity. It is not yet clear whether the role of the centrosome in polarity determination is microtubule dependent or independent.
930885
http://www.iknow.net/CDROMs/cell_cdrom/index.shtml\n\nCheck this site out! It has both plant and animal cell division! Hope it helps ya!! =o)
910568
During prophase. But it actually doesn't happen in all organisms. Yeast for example has a nuclear duplication and division without ever breaking down the nuclear membrane.