BIO 1140 Lecture Notes - Lecture 3: Integrin, Endoplasmic Reticulum, Cartilage

• School: University of Ottawa
• Department: Biology
• Course: BIO 1140
• Professor: Kathleen Gilmour

Document Summary

Pectin is a sticky, jelly like, branched polysaccharide that forms networks, strong negative charge which attracts water. Synthesis of a cellulose molecule happens on the plasma membrane, extracellular surface, catalyzed by rosette enzymes. Enzyme rosettes moves around on the membrane by motor proteins, cells control the movement pattern of the rosettes along the cell wall. Then it synthesises the primary cell wall, which has a loose network of cellulose micro fibrils which can expand, is flexible. Then the secondary cell wall, which gives plants their strength, laid down as a serious of layers made of cellulose micro fibrils organized differently to provide strength and also lignin to provide extra strength. Rosettes move around on microtubules controlled by the cell in different patterns per layer. Form a cytoplasmic connection from one side to the next, cell wall forms around the endoplasmic reticulum creating a desmotubule through an annulus which is the route for ions, small molecules.