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

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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

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

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

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

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

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

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