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Copyright © 2004 Pearson Education, Inc. publishing as Benjamin Cummings PowerPoint ® Lecture Slides for Essential Biology, Second Edition & Essential.

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Presentation on theme: "Copyright © 2004 Pearson Education, Inc. publishing as Benjamin Cummings PowerPoint ® Lecture Slides for Essential Biology, Second Edition & Essential."— Presentation transcript:

1 Copyright © 2004 Pearson Education, Inc. publishing as Benjamin Cummings PowerPoint ® Lecture Slides for Essential Biology, Second Edition & Essential Biology with Physiology Neil Campbell, Jane Reece, and Eric Simon Presentation prepared by Chris C. Romero CHAPTER 4 A Tour of the Cell Figures 4.4 – 4.7

2 Copyright © 2004 Pearson Education, Inc. publishing as Benjamin Cummings The countless cells on earth fall into two categories The Two Major Categories of Cells –Prokaryotic cells –Eukaryotic cells

3 Copyright © 2004 Pearson Education, Inc. publishing as Benjamin Cummings Prokaryotic and eukaryotic cells differ in several respects Figure 4.4 Prokaryotic cell Nucleoid region Eukaryotic cell Nucleus Organelles

4 Copyright © 2004 Pearson Education, Inc. publishing as Benjamin Cummings Prokaryotic cells –Are smaller than eukaryotic cells –Lack internal structures surrounded by membranes –Lack a nucleus

5 Copyright © 2004 Pearson Education, Inc. publishing as Benjamin Cummings Figure 4.5 Prokaryotic flagella Nucleoid region (DNA) Ribosomes Plasma membrane Cell wall Capsule Pili

6 Copyright © 2004 Pearson Education, Inc. publishing as Benjamin Cummings An idealized animal cell A Panoramic View of Eukaryotic Cells Figure 4.6A Cytoskeleton Ribosomes Centriole Lysosome Flagellum Not in most plant cells Nucleus Smooth endoplasmic reticulum (ER) Golgi apparatus Rough endoplasmic reticulum (ER) Mitochondrion Plasma membrane

7 Copyright © 2004 Pearson Education, Inc. publishing as Benjamin Cummings An idealized plant cell Figure 4.6B Cytoskeleton Mitochondrion Nucleus Rough endoplamsic reticulum (ER) Ribosomes Smooth endoplasmic reticulum (ER) Golgi apparatus Plasmodesmata Plasma membrane Chloroplast Cell wall Central vacuole Not in animal cells

8 Copyright © 2004 Pearson Education, Inc. publishing as Benjamin Cummings The plasma membrane separates the living cell from its nonliving surroundings MEMBRANE STRUCTURE AND FUNCTION

9 Copyright © 2004 Pearson Education, Inc. publishing as Benjamin Cummings The membranes of cells are composed of A Fluid Mosaic of Lipids and Proteins –Lipids –Proteins

10 Copyright © 2004 Pearson Education, Inc. publishing as Benjamin Cummings The lipids belong to a special category called phospholipids Phospholipids form a two-layered membrane, the phospholipid bilayer Figure 4.7A Hydrophilic head Hydrophobic tail Outside cell Cytoplasm (inside cell) (a) Phospholipid bilayer of membrane

11 Copyright © 2004 Pearson Education, Inc. publishing as Benjamin Cummings Most membranes have specific proteins embedded in the phospholipid bilayer Figure 4.7B Hydrophilic region of protein Phospholipid bilayer Hydrophobic region of protein (b) Fluid mosaic model of membrane


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