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Unformatted text preview: January 28 Monday, January 28, 2008 8:01 AM Audio recording started: 8:01 AM Monday, January 28, 2008 Adenosine Triphosphate (ATP_ High-energy molecule that is derived from the nucleoptide adenine Contains 3 phosphate groups and high-energy chemical bonds that each time the bonds are broken, a large amount of energy is generated Energy is released by ATP is broken down by hydrolysis rxn ATP + water --> ADP + phosphate (incomplete) ATP structure: Adenosine = adenine + ribose Adenine is nucleotide base Ribose is sugar 3 phosphate groups Next Chapter: cell Membrane and Transport Cell Membrane To enclose organelles and other contents in cytoplasm To protect the cell To allow substances into and out of the cell To have metabolic reactions on its surface "Fluid Mosaic Model" suggests that the phospholipids form a bilayers framework, with their hydrophilic (polar) heads on the surface and their hydrophobic (nonpolar) tails on the inside. Proteins are embedded in the phospholipds bilayers. Experimental data have indicated that the in this model are securely held to the phospholipids, making the structure very stable. Membrane is made up of fat and protein. Polar means charged. Fluid Mosaic Model picture from cell bio book Polar heads outside, non-polar tails inside Proteins have channels that allow certain materials in Polar substances cannot cross membrane (cannot dissolve in fat) so they have to use channels Cholesterol is fat and can cross membranes...
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- Spring '08