BCMB 311 Study Guide - Midterm Guide: Retina, Cadherin, Hemidesmosome
16 Dec 2016
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Extracellular matrix and connective tissues: plant cells. The supportive matrix is called a cell wall. Cell walls are tough but not rigid. Can be filled with water to distend the cells and create turgor pressure. Primary cell walls: primarily composed of pectin, not as strong and sturdy as secondary walls, allow growth; usually found on the outside of plant. Secondary cell walls: primarily composed of cellulose, formed by thickening of primary wall or deposition of new layers with a different composition. Complexes transport sugar monomers across the membrane and add them to growing chains. Each chain assembles to form cellulose microfibril: complexes move through the membranes trailing cellulose behind them, complexes follow microtubules under the plasma membrane. Waxy, waterproof leaves: lignin: network of polymers embedded in the cellulose cell wall. Hard, thick, woody walls: animal cells. Extracellular matrix is extensive: it carries the bulk of the tensile force.
