| Nuclear Envelope |
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| CATEGORIES ABOUT NUCLEAR ENVELOPE | |
| cell anatomy | |
| nuclear substructures | |
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Numerous Nuclear Pores are present on the nuclear envelope to facilitate and regulate the exchange of materials (for example, Protein s and RNA ) between the nucleus and the cytoplasm. The inner membrane is erected upon the Nuclear Lamina , a network of Intermediate Filament s made of Lamin , that plays a role in Mitosis and Meiosis . The type of Lamins present are A, B1, B2, and C. The 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. DISINTEGRATION DURING MITOSIS IN METAZOANS During Prophase in Mitosis , the Chromatid s begin replicating to form Chromosome s, and the nuclear envelope begins to disintegrate. During Metaphase , the nuclear envelope is completely disintegrated, and the chromosomes can be pulled apart as chromotins by the Spindle Fiber s. Other Eukaryotes such as yeast undergo closed mitosis, where the chromosomes segregate within the nuclear envelope, which then buds as the two daughter cells divide. |
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