Unformatted text preview: 6O2 <---> 6CO2 + 6H2O
Carbon is OXIDIZED
loses electrons Oxygen in REDUCED
gains electrons Energy Sources for organisms
What do these molecules have in common? DO NOT MEMORIZE!!! Summary: Organisms obtain
useful energy from light or by
oxidizing substrate molecules
found in the environment What about this diffusion
X is a solute molecule in water Membrane
XX X X
X X Metabolic Diversity
– 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?
• 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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