1. Chapter 4 Cytoskeleton, Cell wall and EMC

2. You Must Know The structure and function of the cytoskeleton. (You will only be tested on the parts of the cytoskeleton that we go over in class today.) The structure and function of the plant cell wall and the animal ECM. Organelles found only in plant cells or only in animal cells. (Page 72-73)

3. Concept 4.6: The cytoskeleton is a network of fibers that organizes structures and activities in the cell The cytoskeleton is a network of fibers extending throughout the cytoplasm. It organizes the cell’s structures and activities, anchoring many organelles. © 2014 Pearson Education, Inc.

4. Figure 4.21 Receptor for motor protein Vesicle Motor protein (ATP powered) ATP Microtubule of cytoskeleton (a)Motor proteins “walk” vesicles along cytoskeletal fibers. Roles of the Cytoskeleton: Support and Motility

5. Microtubule Centrioles Centrosome Centrosomes and Centrioles – animal cells

6. Cilia and Flagella

7. Cell Walls of Plants The cell wall is an extracellular structure that distinguishes plant cells from animal cells Prokaryotes, fungi, and some protists also have cell walls The cell wall protects the plant cell, maintains its shape, and prevents excessive uptake of water Plant cell walls are made of cellulose fibers embedded in other polysaccharides and protein © 2014 Pearson Education, Inc.

8. Figure 4.25 Secondary cell wall Central vacuole Primary cell wall 1  m Middle lamella Plasmodesmata Cytosol Plasma membrane Plant cell walls

9. The Extracellular Matrix (ECM) of Animal Cells The ECM is made up of glycoproteins

10. Figure 4.27 1  m Intermediate filaments TEM 0.5  m TEM 0.1  m TEM Tight junction Tight junction Ions or small molecules Extracellular matrix Gap junction Desmosome Space between cells Plasma membranes of adjacent cells Tight junctions prevent fluid from moving across a layer of cells