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Chapter 5 of "The Cell" provides an overview of cell theory, emphasizing that all organisms are composed of cells, which are the smallest units of life. Cells come only from preexisting cells, highlighting their essential role in biology. The chapter discusses the structure and function of the plasma membrane, cytoplasm, cytoskeleton, and organelles like chloroplasts and mitochondria. Key visual aids include microscopy images and animations that illustrate cellular components and dynamics, reinforcing the concept of the fluid mosaic model of membrane structure.
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The Cell: An Overview Chapter 5
Cell Theory: Fundamental to Life • All organisms are cellular • Cell: the smallest unit of life • Cells come only from preexisting cells
Examples of Cells Fig. 5-2, p. 92
Bright field microscopy Fig. 5-4a, p. 94
Dark field microscopy Fig. 5-4b, p. 94
Plasma Membrane Fig. 5-6, p. 95
Plasma Membrane • Plasma membrane defines cytoplasm • Lipid bilayer and proteins • Hydrophobic • Selective passage hydrophilic • Internal environment of cell different from external
Typical Plant Cell Fig. 5-9a, p. 100
Electron Micrograph Plant Cell Fig. 5-9b, p. 100
Microbodies Fig. 5-17, p. 107
Chloroplast Large central vacuole Cytosol Mitochondrion Microbody Chloroplast Fig. 5-17, p. 107 (removable labels)
Cytoskeleton • Cytoskeleton • Maintains shape and organization • Interconnected protein fibers and tubes • Most prominent in animal cells • Plants and fungi also use cell walls and central vacuole
Cytoskeleton Examples Fig. 5-18, p. 107
Cell Wall Structure Fig. 5-25, p. 112
Extracellular Matrix Fig. 5-27, p. 115
