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Cell Analogy – Plane
Cell Analogy – Plane

... because it keeps everything in the nucleus and keeps other things out. Nuclear pore – the nuclear pore is analogous is the doors of the city hall, because they only let in the important officials that go into the nucleus to collect information and later come out to tell the rest of the city what to ...
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Chapter ONE - VU Research Portal

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Full Text - Verlag der Zeitschrift für Naturforschung
Full Text - Verlag der Zeitschrift für Naturforschung

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Organelle Trail - cloudfront.net
Organelle Trail - cloudfront.net

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Figure 1 - Philosophical Transactions of the Royal Society B
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Ecto-enzymes ofmammary gland and its tumours
Ecto-enzymes ofmammary gland and its tumours

... are accessible. The responses of the activity to Ca2+ and Mg2+ are nearly the same. There is a small amount of residual activity (approx. 3%) in the absence of added bivalent cation, which is not removed by the addition of 1 mM-EDTA. The effects of the Ca2+ and Mg2+ are additive when they are added ...
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Mitosis



Mitosis is a part of the cell cycle in which chromosomes in a cell nucleus are separated into two identical sets of chromosomes, each in its own nucleus. In general, mitosis (division of the nucleus) is often followed by cytokinesis, which divides the cytoplasm, organelles and cell membrane into two new cells containing roughly equal shares of these cellular components. Mitosis and cytokinesis together define the mitotic (M) phase of an animal cell cycle—the division of the mother cell into two daughter cells, genetically identical to each other and to their parent cell.The process of mitosis is divided into stages corresponding to the completion of one set of activities and the start of the next. These stages are prophase, prometaphase, metaphase, anaphase, and telophase. During mitosis, the chromosomes, which have already duplicated, condense and attach to fibers that pull one copy of each chromosome to opposite sides of the cell. The result is two genetically identical daughter nuclei. The cell may then divide by cytokinesis to produce two daughter cells. Producing three or more daughter cells instead of normal two is a mitotic error called tripolar mitosis or multipolar mitosis (direct cell triplication / multiplication). Other errors during mitosis can induce apoptosis (programmed cell death) or cause mutations. Certain types of cancer can arise from such mutations.Mitosis occurs only in eukaryotic cells and the process varies in different organisms. For example, animals undergo an ""open"" mitosis, where the nuclear envelope breaks down before the chromosomes separate, while fungi undergo a ""closed"" mitosis, where chromosomes divide within an intact cell nucleus. Furthermore, most animal cells undergo a shape change, known as mitotic cell rounding, to adopt a near spherical morphology at the start of mitosis. Prokaryotic cells, which lack a nucleus, divide by a different process called binary fission.
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