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By V. Sreekrishna

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Import of proteins is regulated by either phosphorylation or by binding of proteins which cover the nuclear localization signals for importing, binding and subsequent protein transport. RNAs are transported out of the nucleus; they are transported as ribonucleoprotein complexes. One of the proteins associated with the RNA acts as a signal for transport. (3) Nuclear matrix provides ultraskeletal structure for the nucleus and acts as a support for various reactions and domains. Nuclear region contains a cluster of rRNA genes.

However, eukaryotic cells are quite complex and contain a nucleus, a variety of cytoplasmic organelles and a cytoskeleton. The size of eukaryotic cell varies from 1u to 175000µ (175 mm), The ostrich egg is the largest cell. 5 feet The number of cells per organism also varies from a single cell in protozoans to millions of cells in higher plants and animals. Unlike prokaryotes, eukaryotic cells are organised into tissues and organs, all of which perform specific functions. Plant cells have a thick complex cell wall whereas the animal cell does not possess any such structure.

They occur almost in all cells with a diameter of 50500 mµ. (c) Vesicles are oval membrane bound vascular structures with a diameter of 25-500 mµ they remain isolated in the cytoplasm and are abundantly found in pancreas. Structurally, it is trilaminar 50-60 Å thick membrane having continuation with the nuclear membrane Golgi body and plasma membrane. R. R. R. R. is devoid of ribosomes. R. Also it is found in glycogen storing liver cells, adipose cells, interstitial cells, leucocytes and spermatocytes.

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