The chemistry of life is organized into metabolic pathways. Metabolism is a collection of chemical reactions that occur in an organism. It is aided by enzymes particularly, this is how it follows catabolic pathways or anabolic ones. The difference between the two is that catabolic means to break up while anabolic means to build. Cellular respiration and fermentation are catabolic, energy-yielding pathways. The most important part to remember in these few chapters is that respiration involves glycolysis, the krebs cycle, and the electron transport. Glycolysis and the Krebs cycle supply electrons to the transport chain. The places in which these processes occur is that glycolysis occurs in the cytosol, the krebs cycle in the mitochondrial matrix and the electron transport chain is built into the inner mitochondrial membrane. When there is no oxygen for cellular respiration to occur, fermentation enables some sells to produce ATP without the help of oxygen. One extremely important thing to remember is that ATP is basically the cell's energy shuttle. ATP drives endergonic reactions by the transfer of the phosphate to specific reactants. It comes from ADP and turns into ATP after the phosphate is added in. As for photosynthesis, the organic compounds produced by photosynthesis provide the energy and building material for ecosystems.
SOURCES: Campbell book and wordle.net
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