1. Catabolism

2. Anabolism

Metabolism = Catabolism + Anabolism

Energy and Metabolism: An Analogy

Senseless Catabolism

The World Trade Center towers collapsing. The remnants of the World Trade Center towers.

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Useful Catabolism

The Coliseum of ancient Rome. St. Peter's Basilica.

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Catabolism and Anabolism in Living Organisms

Metabolism Summary

Catabolism (Catabolic Pathways)

Anabolism (Anabolic Pathways)

Energy and Reactions

Free Energy: The Energy That Makes It All Happen!

Free energy is energy available to do work.

A diagram illustrating free energy with the example of a girl on a slide.

Figure 6.4, page 87, Campbell's Biology, 5th Edition

Exergonic versus Endergonic Reactions

Adenosine Triphosphate (ATP): an Energy Rich Molecule

A detailed diagram of ATP, viewed from several pictoral perspectives.

Figure 6.5(a), Purves's Life: The Science of Biology, 7th Edition

Shows the cycle between ATP and ADP, as well as the energy inputs and outputs.

Figure 6.8, page 90, Campbell's Biology, 5th Edition

An Example of ATP Use and Coupling of Reactions

Shows the use of ATP to add a nitrate group to a glutamate molecule, as a coupled exergonic/endergonic reaction.

Figure 6.7, Purves's Life: The Science of Biology, 7th Edition