BIOLOGY 2A03 Lecture Notes - Lecture 2: Lipid Bilayer, Membrane Transport, Transmembrane Protein
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12 Feb 2020
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January 8th 2020 - lecture 2 membrane transport. Different types of transport processes used in cells. Define chemical and electrical driving forces of diffusion and equilibrium potential. Water diffusion as a function of permeating and non permeating solutes. Various biochemical pathways are used to convert energy into atp; conversion of chemical energy into atp used for many processes (ex. Importance of a membrane is to isolate contents from environments; Main cation in intracellular fluid (k+ ) vs main cation in extracellular fluid (na+) This occurs because cells use membrane transport to create these conditions; They invest energy to transport substances across membranes (most energy costly) - the ions allow for stored potential energy in concentration differences (chemical diffusion and electrical voltage gradients) between inside and outside. Membrane that surrounds cells is made up of phospholipid bilayer (the key barrier that keeps things in, and keeps things out)
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