Concept 1 - Concept 7.3 The eukaryotic cell’s genetic instructions are housed in the nucleus and carried out by the ribosomes The nucleus

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Unformatted text preview: Concept 7.3 The eukaryotic cell’s genetic instructions are housed in the nucleus and carried out by the ribosomes The nucleus contains most of the genes in a eukaryotic cell. Additional genes are located in mitochondria and chloroplasts. The nucleus averages about 5 microns in diameter. The nucleus is separated from the cytoplasm by a double membrane called the nuclear envelope. The two membranes of the nuclear envelope are separated by 20–40 nm. The envelope is perforated by pores that are about 100 nm in diameter. At the lip of each pore, the inner and outer membranes of the nuclear envelope are fused to form a continuous membrane. A protein structure called a pore complex lines each pore, regulating the passage of certain large macromolecules and particles. The nuclear side of the envelope is lined by the nuclear lamina, a network of protein filaments that maintains the shape of the nucleus.filaments that maintains the shape of the nucleus....
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This note was uploaded on 01/04/2012 for the course BSC BSC1005 taught by Professor Orlando,rebecca during the Fall '10 term at Broward College.

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