1-06 Membranes Slides - Biol 200: Lec 3 Membranes &...

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Dr. :Lara 1 Functions of Cell Membranes • Separates internal environment from external environment. • Provides a selective barrier: allows only certain molecules to pass through. • Concentrates reactants and increases reaction rate. How did the first pre-cell, cell, come to be? Biological Membranes Lipids: A collection of carbon-containing compounds that are largely nonpolar and hydrophobic in nature. Bangham (~1950’s) lipids in a water form enclosed compartments filled with water: vesicles Basic structure of two types of lipids hydrocarbon Fig. 6.2 Fig. 6.3
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Dr. :Lara 2 Three important lipids found in cells Bacteria Eukarya Archaea Ether bond Ester bond Length of FA chain Degree of saturation- single or double bond Fatty acids Isoprene units Fig. 6.5 Phospholipid bilayer liposomes What types of molecules or ions can cross membrane and how rapidly? Is membrane selective permeability?
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1-06 Membranes Slides - Biol 200: Lec 3 Membranes &...

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