3. Function of the Cell Wall  plant cells, some bacterial cells, fungi  Rigid, protective layer around plasma membrane 10-100 x thicker than plasma membrane

4. Function of the Cell Wall  Mechanical support for the cell Maintains shape of plant cells Prevents excess water intake Holds the plant up against the force of gravity

5. Primary Cell Wall  First formed cell wall  Outermost layer  Comparatively thin and flexible.

6. Secondary Cell Wall  Lays between the plasma membrane and primary wall  Strong and durable  Provides cell protection and support Ex: Wood

7. Middle Lamella  Thin layer of sticky polysaccharides (pectins)  Lays between primary cell walls  Glues adjacent walls together

11. Plasmodesmata  Intercellular cytoplasmic bridges  Facilitates communication  Aids in the transport of materials b/w cells Water Nutrients Signalling molecules Even viruses! (Shhh!!!)

12. http://www.glogster.com/alexanderhesekth/cell-wall-and-cell-membrane/g-6ltaq1bmv7u25246docmva0