NROS 307 Lecture Notes - Lecture 4: Lipid Bilayer, Membrane Fluidity, Phospholipid
30 Aug 2016
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Lecture 4 - basic of membranes - part 1. Define the cell and in eukaryotes it defines intercellular organs (e. g. nucleus, mitochondria, lysosome) They all have the same membrane structure - phospholipid bilayer which serves as a permeability barrier in which proteins are embedded. Separate fluids and their varying ionic concentrations and environments. Regulates the entry and exit of ions, amino acids, sugars, etc. Even though we know that the cytoskeleton is what maintains the structure of the cell, the membrane"s hydrophobicity and impermeability also help define the structure. Even though it is polar it can go through the membrane because it"s small. When you have a bilayer, you can form different structures: Liposomes and membrane bilayer pretty much have a similar structure except that the liposome is a vesicle. Some catalyze atp synthesis and initiation of dna replication. Membrane transport proteins enable amino acids, sugars, and ions to cross the impermeable lipid bilayer.
