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

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

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

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

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

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