BIOL 1011 Lecture Notes - Lecture 4: Stolon, Aerial Root, Glycan
5 Feb 2020
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Lecture 4 - plant structure: cell types and primary. Readings: chapters 35. 4 - end, 36. 1 - 36. 4: plant structure. There are two systems in vascular plants: shoots and roots. Vertical shoots emerge from axillary buds at nodes. Prop roots, storage roots, green roots, pneumatophores, strangling aerial roots. Feature of plant cells (not animal cells) Composed mostly of cellulose (polysaccharide of glucose units) 2 kinds of cell walls have either the primary wall which is thin and occurs in all cells and the secondary wall which is thicker and occurs only in some cells (strength) However, remember that the wall is very porous and allows the free passage of small molecules: carbohydrate storage - the components of the wall can be reused in other metabolic processes (especially in seeds) Polymer (chain) of up to 25,000 glucose molecules. 36 chains bond to make micro bril: cross-linking glycans (hemicellulose) - bond with cellulose, pectin - jellylike glue.
