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What is a cell wall?

What is a cell wall? Here are some definitions.

Noun
  1. (cytology) A thick, fairly rigid, layer formed around individual cells of bacteria, Archaea, fungi, plants, and algae (but not animals and other protists which generally have cell membranes without cell walls). The cell wall is external to the cell membrane and serves a structural function helping the cell maintain its shape and protecting the cell from damage.
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Examples
Presumably, the shock treatments that elicit bursting disrupt the balance of wall synthesis and lysis responsible for cell wall extension.
Studies on the bamboo cell wall have focussed mainly on fully elongated and mature fibres.
The outermost layer of the cell wall is composed of diverse proteins bearing polysaccharide side chains composed of mannose.
This would also increase the sloughing off of cell wall surface polymers in the culture medium.
Proteins involved with cell wall biogenesis, which display low connectivity levels, have a clear trend of later appearance.
Fungal cells maintain a very high turgor pressure, so the integrity of the cell wall is a critical matter.

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