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Lecture 25

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Louise Dawe

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Biology October 30, 2013 Signal Transduction Pathways - Signal relayed in cell by protein kinases Protein kinases - Enzymes that transfer phosphate group fromATP to one or more sites on particular proteins - Added phosphate groups stimulate or inhibit activities of target proteins Protein phosphatases - Reverse response by removing phosphate groups from target proteins  continuously active Chapter 6 – Cellular Respiration (flow of energy through biological systems) - Chemical bond is the sharing of an electron - Electrons exist in very discrete orbitals that surround the atomic nucleus - Electrons in these orbitals contain different amount of energies (farther = more energy and closer = less energy) - not all ato
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