Lecture 9_Energetics_iClicker

Chloroplasts co2 h2o cellular respiraon in

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Unformatted text preview: as the giant panda, obtain energy by ea<ng plants, and some animals feed on other organisms that eat plants Light energy •  Energy flows into an ecosystem as sunlight and leaves as heat •  Photosynthesis generates O2 and organic molecules, which are used in cellular respira<on •  Cells use chemical energy stored in organic molecules to regenerate ATP, which powers work ECOSYSTEM Photosynthesis in chloroplasts CO2 + H2O Cellular respira.on in mitochondria ATP ATP powers most cellular work Heat energy Organic + O molecules 2 Catabolic Pathways and Produc.on of ATP •  The breakdown of organic molecules is exergonic •  Fermenta.on is a par<al degrada<on of sugars that occurs without O2 •  Aerobic respira.on consumes organic molecules and O2 and yields ATP •  Anaerobic respira.on is similar to aerobic respira<on but consumes compounds other than O2 Redox Reac.ons: Oxida.on and Reduc.on •  The transfer of electrons during chemical reac<ons releases energy stored in organic molecules •  This released energy is ul<mately used to synthesize ATP The Principle of Redox •  Chemical reac<ons that...
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This document was uploaded on 03/06/2013.

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