BI110 Lecture Notes - Lecture 15: Active Transport, Uniporter, Membrane Transport Protein
Document Summary
Hormones such as testosterone and corisol are small molecules that are derivaives of cholesterol. They"re hydrophobic so they can get into the cell. Fluidity of a phospholipid bilayer is increased by. Double bonds between carbon atoms in the faty acid tails. Poor alignment (loose packing) of faty acid tails. Membrane permeable to water but not to solute (sugar) Equilibrium reached when concentraion is equal on both sides. Big enough to allow water across the membrane, but too small for sugar. Low sugar concentraion high concentraion of free water. High sugar concentraion low concentraion of free water. At equilibrium, the concentraion of free water is the same. Moves in opposite direcion ill equilibrium is reached. Concentraions on both sides are the same but liquid levels may be diferent. Water moves into or out of cells depending on the tonicity of the soluions: isotonic soluion. Has the same solute concentraion as the intracellular.
