B1.1.6 - Structure of cellulose related to its function as a structural polysaccharide in plants

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Cellulose Structure

  • Made of beta D glucose monomers (1 and 4 hydroxyls on opposite sides)

  • Beta 1→ 4 linkages (glucose molecules bond together in straight, alternating lines

  • Beta linkages are indigestible by eucaryotes

  • Plants cannot use for energy, only animals


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Role of Cellulose in Plants

  • Cell wall of plant cell

  • Forms xylem and hygroscopic

  • Wood of plants is made of cellulose

  • Cellulose polymers stack into fibrils


<ul><li><p>Cell wall of plant cell</p></li><li><p>Forms xylem and hygroscopic</p></li><li><p>Wood of plants is made of cellulose </p></li><li><p>Cellulose polymers stack into fibrils </p></li></ul><p></p>
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Fibrils

  • Tiny thread-like bundles of cellulose chains

  • Cellulose chains stick together via hydrogen bonds, which give cell walls strength


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Hygroscopic

  • Means a substance absorbs water from the air