Cell Wall & PlasmodesmataBiology 4 Honors

Robyn RitchieEunice Briet

Function of the Cell Wall

plant cells, some bacterial cells, fungi Rigid, protective layer around plasma

membrane10-100 x thicker than plasma membrane

Function of the Cell Wall Mechanical support for the cell

Maintains shape of plant cellsPrevents excess water intakeHolds 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 supportEx: 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

cellsWaterNutrientsSignalling moleculesEven viruses! (Shhh!!!)

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