BIOL 1001 : Bio Exam 2 Review
Document Summary
Chapter 5: functions, properties and components of the plasma membrane, functions. Structure phospholipid bilayer: heads are hydrophilic, tails are hydrophobic, proteins scattered between, cholesterol stabilized the phospholipid layer, components. Factors: temperature and lipid composition (more fluid: plasma membrane fig. 5. 1: membrane proteins (receptor, recognition, carrier, and channel, receptor calls cells to do something (substrate will bind to receptor and signal to do something, recognition recognize a cell as a self cell . Selectively permeable the property of biological membranes which allows some substance to cross more easily than others: diffusion the net movement of a substance down a concentration gradient. Movement is from the greater concentration to lower concentration. The greater the concentration difference, the faster the diffusion. New movement continues until the system reaches equilibrium. Simple diffusion from high concentration to low concentration: do not need use of protein (goes straight to plasma membrane, ex: water, oxygen, and carbon dioxide.
