Biology 2382B Lecture 6: Cell Bio Lecture 6

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Integrating cytoskeleton structure and transport, cell adhesion and membrane transport in epithelial cell functions. Transport across membranes need to import and export large or charged molecules. Conc. gradient is the strongest mover of molecules. Symporter: 2 things moving in the same direction. Atp pumps: use atp to pump molecules against the conc. gradient. Integral membrane proteins which create holes in the membrane, large enough for solutes to pass through. Only k+ interacts properly with polar amino acids to shed its hydration shell and pass through the channel. Area of high conc. to low conc. A hole through the plasma membrane which is lined by proteins that make up the channel. When you dissolve positive ions such as potassium in water it gets a water shell (surrounds itself by a shell of water) For potassium to move trough the channel it must lose the water shell which can be done in energetically favourable conditions.

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