BIOL130 Lecture Notes - Lecture 11: Connective Tissue Disease, Adherens Junction, Rechargeable Battery
Document Summary
Unit 11: cells and their social networks - november 24, 29. Membrane proteins interact with cytoskeletal fibres (actin) just inside the plasma membrane. Cross-linked network of filaments: resists stretching and straining forces. Actin is the most abundant protein in an animal cell. The cell wall is an extracellular network that is built around the plant cell. Their cells are weak and fragile if separated from their walls. Have no intermediate filaments like animal cells. Happy in hypotonic solution (net flux of water inwards) Primary cell wall: secreted as cells are growing, relatively thin. Cellulose: microfibrils form network filled by gel-forming pectins. Secondary cell wall: in mature cells (after plant is done growing), only some cell types. Middle lamella: gelatinous pectins that glue cells together. Pectins: made in rough er, processed in golgi, secreted, used as fillers. Cellulose: made at plasma membrane, by protein complexes, provides structure. Much thicker than the primary wall: cell becomes rigid.