BSCI 201 Lecture Notes - Lecture 5: Lipid Bilayer, Cell Membrane, Signal Transduction
14 Sep 2016
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Document Summary
2nd level of structural complexity within human body- cellular level. Different sub-cellular components: all three determine the overall function of a cell, structure defines function- even at cellular level. A cell is the basic structure and functional unfit of all organisms. According to the principle of complementarity of structure and function, the biochemical reactions occurring in a cell are dictated by the subcellular structures present in the cell. Plasma membrane- defines boundary of a cell: made up of phospholipid bilayer- selective barrier. Tails are nonpolar and hydrophobic and are on the side of the plasma membrane. The two layers are needed for the assembling of the plasma membrane. Anything that is hydrophilic or polar, they will have to go through the membrane proteins: have membrane proteins can acts as a receptor and bring things across and cause a whole reaction with enzymes. Pores: both channels and pores are transport polar substances across the nonpolar lipid bilayer.
