In class notes for September 28, 2007

In class notes for September 28, 2007 - Introduction to...

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Introduction to Biological Sciences 110a In class notes for September 28, 2007 Metabolism o The reaction side of biochemistry o Most reactions either Extract energy from the environment Or function in biosynthesis Provide reducing power for biosynthesis o The majority of reactions occur in pathways (consecutive reactions) o Remarkable things The reactions have to take place in the same conditions (usually achieved by enzymes) All reactions must take place in the same place (same compartment)(this is aided by specific enzymes and interconnecting tubles) The materials must be interchangable o Fuel molecules are funneled into the major pathways than the compounds are made from a few key intermediates. o Chemicals ways to extract energy Most living things oxidize fuel molecules to obtain energy We particularly oxidize lipids(fats, oils) , carbohydrates (sugars, starches), proteins. Also oxygen to carbon dioxide and water Use oxidation intermediates for biosynthesis We often need to reduce our intermediates. Many molecules, like lipids, do not contain oxygen, they have a lot of hydrogen Metabolic reactions can either break down or build molecules o Reactions an be Catabolic (breaking down) Anabolic (sythesis) o The oxidation of glucose is catabolism
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In class notes for September 28, 2007 - Introduction to...

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