Ch7Top10 - Chapter 7 Tour of a Cell Top 10 Most Important...

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Jesse Tan-Alper Valerie Presley May 2008 1 ° Chapter 7: Tour of a Cell Top 10 Most Important Things to Know 1. Prokaryotic and eukaryotic cells differ in size and complexity. All cells are bounded by a plasma membrane. Bacteria and archaea have prokaryotic cells, without nuclei or other membrane- enclosed organelles. All other organisms have eukaryotic cells, with membrane-enclosed nuclei and other membranous organelles in their cytoplasm. The need for a high surface-to- volume ratio limits cell size. 2. The nucleus contains a eukaryotic cell’s genetic library. DNA is organized with proteins into thin fibers of chromatin, which coil to form thick chromosomes in dividing cells. Associated with the chromatin in nondividing cells are one or more nucleoli, sites of ribosome synthesis. Macromolecules and ribosomal subunits pass between nucleus and cytoplasm through pores in the nuclear envelope. 3. Ribosomes build a cell’s proteins. Free ribosomes in the cytosol
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This note was uploaded on 10/30/2009 for the course SI 0126 taught by Professor Gourney during the Spring '09 term at École Normale Supérieure.

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Ch7Top10 - Chapter 7 Tour of a Cell Top 10 Most Important...

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