Cell wall

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The Cell wall is a unique structure in plant cells (and some prokaryotic cells) but not present in any eukaryotes animal cell. The Plasma membrane is surrounded by the cell wall, and can increase the tensile strength, osmotic stress and mechanical protection of the plant cell. Furthermore, plant cells can develop turgor pressure with the presence of cell wall of which is the pressure of the cell contents against the cell wall.

Plant cell wall consist of three major layers: plasma membrane, primary cell wall and a middle lamella. Middle lamella is the outermost layer of the cell wall connecting the environment of which containing soluble protein and pectin. Primary cell wall contain cellulose microfibrils, hemicellulose, pectin, lignin, and soluble proteins.

Cell wall helps to maintain plant cell structure integrity in different conditions. In the normal supply of water, water molecules diffuse into the plant cell via osmosis where the cytoplasm of the plant cell is lower than water since the presence of high concentration of soluble molecules. Cell wall prevents plant cell from burst against the over intake of water. In a drought, plant cell loses water through transpiration that cells will be wilt and cell walls keep the plant structure of integrity[1].

Reference

  1. http://www.nature.com/scitable/topicpage/plant-cells-chloroplasts-and-cell-walls-14053956
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