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Campbell_06 - Chapter 06 Tour of the Cell Prokaryotes vs...

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Chapter 06 Tour of the Cell
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Prokaryotes vs. Eukaryotes Two very different kinds of cells Prokaryotic – lacks membrane bound organelles Eukaryotic – posses membrane bound organelles
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Cell Size and Surface to volume Ratio
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Plasma Membrane Functions as a selective barrier that allows sufficient passage of oxygen, nutrients, waste to service the entire volume of the cell
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Nucleus Nucleus – contains most of the genes in a eukaryotic cell (the chapter deals with only eukaryotic cells) Nuclear envelope – double bilayer Chromatin – DNA with associated proteins Nucleolus – dark center where rRNA is made
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Ribosomes Particles made of rRNA and protein Carry out protein synthesis Free and bound ribosomes
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Endoplasmic Reticulum (ER) ER – consists of network of tubules and sacs called cisternae Smooth and Rough ER Smooth – lacks ribosomes Rough – posses ribosomes Functions Smooth – synthesis of lipids, metabolize
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