BI110 Lecture Notes - Lecture 6: Micelle, Liposome, Fluid Compartments

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28 Sep 2015
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Bi110 - lecture 6 - water and cells. Water interacts with atoms and separates them, causing them to dissolve. Tend to coalesce with each other in water. Water molecules tend to exclude molecules that disrupt hydrogen bonding. Hydrophobic interactions are a major driving force in folding of molecules (like proteins), assembly of cellular structures, and membrane organization. Membrane is made of phospholipids, preventing it from dissolving in water. Amphipathic: it has a hydrophobic and hydrophilic region. Hydrophobic interactions between the hydrophobic tails hold both phospholipid bilayers together. Polar heads are associated with aqueous solutions. Micelles and liposomes are spontaneously formed because phospholipids are amphipathic. Micelles don"t have aqueous compartments in the middle, liposomes do. Water is a good solvent for these molecules because it"s polar. Unicellular organisms consist of a single cell. Multicellular organisms can have specialized cells for different functions, but cell have same basic structure. Around 200 different types of cells in human body.

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