6.7 cell wall Flashcards
cell wall functions
-protect -maintain shape -turgor pressure
design of cell wall
microfibrils (made out of polysaccharide glucose) are synthesized by cellulose synthase -secreted to the extracellular space -become embedded in a matrix of other polysaccharides an ad proteins - this makes the basic design
primary cell wall
young plant;s first cell wall
middle lamella
between primary walls of adjacent cells is a thin layer of sticky polysaccharides called pectins -glues the cells together
when cell matures and stops growing, it
adds a second cell wall or secrete hard substances on first wall
how do microtubules affect cell growth
they directly guide the path of cellulose synthase as it lays down cellulose -determines the orientation of cellulose fibrils
how are adjacent cell perforated
plasmodesmata -channels between cells
