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Chapter 8

Metabolism, the total sum of an organisms chemical reactions, is an emergent property of life that arises between molecules in the cell.
Think of metabolism as a huge road map, the metabolic pathways being intersections. The pathway begins with a specific molecule, which is then altered in a series of steps that result in a certain product. Each step is catalyzed by a specific enzyme. Think of these as the stop lights.
Though metabolism as a whole manages the material energy resources of the cell, separate metabolic pathways do different things. Some release energy by breaking down complex molecules into simpler ones, call these the catabolic pathways. Cellular respiration is an example of catabolic pathways because sugar glucose and other fuels are broken down in the presence of CO2, using the previously stored energy for work.
Opposing this are the anabolic pathways, which use up energy to build up bigger molecules. An example is making protein from amino......

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