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Unformatted text preview: *photosynthesis=endergonic *cellular respiration=exergonic 4. activation energy: minimum amount of energy needed to start a chemical reaction. *energy can come from ATP from a cell. *ATP= cells energy current 5. ATP, the cells energy currency accepts energy from exergonic reactions.-gives energy to endergonic reactions.-gives energy by giving phosphate groups away.-enzymes also gets a reaction going....
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- Spring '11