Energy and reactions

Energy and reactions

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Unformatted text preview: 6O2 <---> 6CO2 + 6H2O Carbon is OXIDIZED loses electrons Oxygen in REDUCED gains electrons Energy Sources for organisms Energy What do these molecules have in common? DO NOT MEMORIZE!!! Summary: Organisms obtain Summary: useful energy from light or by oxidizing substrate molecules found in the environment What about this diffusion reaction? reaction? X is a solute molecule in water Membrane X XX XX X X X X X X X Metabolic Diversity • Autotrophs – Synthesize organic compounds – Reduction of C • Heterotrophs – Utilize organic compounds made by autotrophs Objective of metabolism: Yield energy in a useful form, e.g., most often as ATP Why ATP? Fig 8.8: Adenosine TriPhosphate Fig 8.9: ATP hydrolysis Why ATP in all organisms? • Stable • Organisms can run reactions with enough energy to make it • Components found in all cells (parts of nucleic acids) How does ATP work? • Life is macromolecules changing shape! • Add the phosphate group from ATP to a molecule and it – Changes shape of the molecule – Adds the high energy bond temporarily to that molecule Fig 8.11: how ATP works...
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This document was uploaded on 03/26/2014 for the course BIOLOGY BIO101 at Tulane.

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