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Lecture_6_Jan_15_four_slides_per_page_

Lecture_6_Jan_15_four_slides_per_page_ - two types of...

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1 Functions of Membrane Transport • To ingest essential nutrients To ingest essential nutrients To excrete metabolic waste or toxic products • To reg late intracell lar composition To regulate intracellular composition two types of membrane transport protein-mediated non-protein mediated (simple diffusion) energy required (active transport) no energy input required (passive transport) no energy input required (passive transport) two types of proteins involved in membrane transport protein-mediated transport Channels (to be discussed next time) Transporters (Carriers, Permeases) (to be discussed today) Five General Considerations for Membrane Transport Whether is energy required for a transport process? If energy is not needed, whether is a protein needed? If energy is needed (a protein is also needed in this case), what is the source of energy? If ions are moved across the membrane how to maintain the If ions are moved across the membrane, how to maintain the electrical neutrality of a cell or compartment? If H + or OH - are moved across the membrane, how to maintain the pH of a cell or compartment?
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