BIOL 150 Chapter Notes - Chapter 11: Apoplast, Guanosine Triphosphate, Plasmodesma
Document Summary
Extracellular structure helps define cell"s shape and either attaches it to another cell or acts as. Chapter 11 first line of defense against the outside world. Animal ecm contains much more protein relative to carbohydrate than does a cell wall. Collagen (fibrous component of animal ecm is dominated by cable-like protein) Tissues (consist of similar cells that function as unit) *molecules that are used to thicken jams and jellies* The concentration of solutes is higher inside cell than outside, causing water to enter cell via osmosis (primary cell wall) Turgor pressure (force exerted by cell against wall) *turgor pressure forces wall to elongate and expand, resulting in cell growth* Expansins (disrupt hydrogen bonds that cross-link microfibrils in wall, allowing microfibrils to slide past one another) Secondary cell wall (between plasma membrane and primary cell wall) Lignin (complex polymer that forms an exceptionally rigid network) Epithelia (singular: epithelium) (tissues that form external and internal surfaces)
