BIOL10004 Chapter Notes - Chapter 4: Ultimate Tensile Strength, Plant Cell, Extracellular Fluid
29 Jun 2018
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The cell wall: a major difference between plant and
animal cells
Plant cell walls share similarities with extracellular matrix that surrounds an animal
cell
Plant cell walls
oStronger
oMore rigid than animal cell extracellular matrix
oComposed of polysaccharides
oForms box-like compartments
oEncases and immobilizes plant cells
Extracellular matrix forms looser and more flexible lattice
Plant cell walls and animal extracellular matrices
Strong tensile fibers are embedded in and cross-linked to porous hydrated gel-like
matrix
oPlant cell wants composed of cellulose
oLong unbranched chain of glucose molecules
oEmbedded in matrix containing pectin's, hemicelluloses
Animal cells
oFibers composed of collagen proteins
oEmbedded in gel of glycosaminoglycan
Extracellular fluid surrounding plant cells contain low concentration of solutes
oWater tends to flow into the cell
oInflux of water pushes plasma membrane against cell wall
oInternal hydrostatic pressure (turgor pressure) builds up
oDuring plant growth, cell wall yield to the force of turgor pressure
oCellulose microfibrils have high tensile strength
oCytoplasm adjacent to cells connect across intervening cell wall through fine,
plasma membrane-lined channels
oPlasmodesmata
oExpansion to adjacent cells carefully coordinated to avoid disruption of
plasmodesmata connections
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Document Summary
The cell wall: a major difference between plant and animal cells. Plant cell walls share similarities with extracellular matrix that surrounds an animal cell. Stronger: more rigid than animal cell extracellular matrix, composed of polysaccharides o o. Extracellular matrix forms looser and more flexible lattice. Plant cell walls and animal extracellular matrices. Strong tensile fibers are embedded in and cross-linked to porous hydrated gel-like matrix: plant cell wants composed of cellulose o o. Extracellular fluid surrounding plant cells contain low concentration of solutes: water tends to flow into the cell o o. Influx of water pushes plasma membrane against cell wall.
