BIOL 116 Lecture Notes - Lecture 4: Metastasis, Polysaccharide, Middle Lamella
2 Dec 2016
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Document Summary
Rods/ filaments in fibre composite withstand stretching and straining forces (tension) Long strands of cellulose, crosslinked by polysaccharide filaments then bundled into microfibrls. Microfibrls made by complex enzymes in plasma membrane making a criss-cross network. Space between microfibrls filled with gelatinous polysaccharides (pectins). They are hydrophilic and keep cell wall moist. Composed in rer and ga, secreted into extracellular space. Counteracts turgor pressure - outward pressure exerted by the fluid contents of a plant cell. Secondary cell walls - the secretion of a layer inside the primary wall when plant cells mature. Basic composition is cellulose, polysaccharides, and few glycoproteins. Lignin - rigid network in cells that form wood. Ecm contains much more protein than a cell wall. Collagen- cable-like protein, more flexible than cellulose/ lignin. Matrix surrounding is gel-forming polysaccharides, attached to a protein core. Integrins - transmembrane proteins that connect actin filaments to the ecm.
