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!!!)