BI110 Chapter Notes - Chapter 18: Phosphorylation, Electrochemical Gradient, Conformational Change
Document Summary
Hydrophobic nature membranes restrict free movement of many molecules and substances essenial for life. The bigger the gradient, the more potenial energy it has and the faster the reacion will occur. Higher the temperature, greater the difusion rate. At a given temperature, smaller molecules difuse faster. The bigger the gradient, the faster the difusion rate. Net movement from high concentraion to low concentraion. Movement is let to right and right to let (random moion) Right side: movement, disordered, most stable, lowest amount of potenial energy. Simple difusion: passive transport of substances across lipid portion of membranes with their concentraion gradients: first type of passive transport. Large or charged molecules may be strongly impeded from crossing membranes: either posiively charged or negaively charged, can"t get across hydrophobic membrane since they"re too big and too charged. Large uncharged polar molecules can"t get through membrane. Even though they"re small they can"t get through the molecule.