BIOL 1103 1st Edition Lecture 8 Outline of Last Lecture II History of the Cell III Prokaryotes vs Eukaryotes IV Cell Parts and Nucleus Outline of Current Lecture V Plasma membrane VI Phospholipids and Hydrophilic and Hydrophobic parts VII Diffusion and concentration gradient VIII Aquaporins IX Active and Passive Transport X Endocytosis Current Lecture Plasma membrane is a thin fluid membrane that manages to be very flexible and yet is stable enough to stay together despite being continually remade due to constant movement Phospholipids make up cell membrane o Composed of fatty acid chains o Has glycocalyx on cell surface o Hydrophobic molecules pass freely through membrane o Hydrophilic molecules do not Diffusion is movement of molecules or ions from highest region of concentration to region of lower concentration Concentration gradient is difference between highest and lowest concentration of solute within given medium Aquaporins selectively conduct water molecules in and out of cell while preventing passage of ions and other solutes Simple diffusion is type of passive transport where molecules move down their concentration gradient through phospholipid bilayer Facilitated diffusion is also passive transport passage is aided by concentration gradient and transport protein Active transport is where molecules move through transport protein but expend energy Endocytosis is taking things into cells there are two methods of endocytosis These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute o Phagocytosis o Pinocytosis
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