APchapter9notes - Chapter 9 notes Cel l ul ar Respi r ati...

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    Chapter 9 notes Cellular Respiration: Harvesting Chemical Energy
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    Concept 9.1 Metabolic pathways that release energy  are called catabolic pathways - fermentation and cellular respiration Fermentation : partial degradation of  sugars that occurs w/out the help of O 2 Cellular respiration : O 2  is consumed as  a reactant along w/ the sugar - more efficient
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    Concept 9.1 Cellular respiration occurs in the  mitochondria  Organic + O 2    Carbon + H 2 O + Energy compounds    dioxide C 6 H 12 O 6  + 6O 2    6CO 2  + 6H 2 O + Energy 1 glucose = -686 kcals
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    Concept 9.1 ATP is the central molecule responsible  for energy used by the cell The cell uses enzymes to transfer  phosphate groups from ATP to other  compounds (making them  phosphorylated ) ATP   ADP + phosphate
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    Concept 9.1 Redox reactions release energy when  electrons move closer to electronegative  atoms - the relocation of electrons releases the  energy stored in food molecules, and this  energy is used to synthesize ATP
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    Concept 9.1 There is a transfer of one or more e- from  one reactant to another; the electron  transfers are called oxidation-reduction  reactions or redox rxns.  - the loss of e- from one substance is  called  oxidation - the addition of e- to another substance  is called  reduction
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    Concept 9.1
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    Concept 9.1 Electrons “fall” from organic molecules to  oxygen during cellular respiration C 6 H 12 O 6  + 6O 2    6CO 2  + 6H 2 O + Energy - by oxidizing glucose, cellular respiration  takes energy out of storage and makes it  available for ATP synthesis - carbohydrates and fats are reservoirs of  electrons associated w/ hydrogen
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  Concept 9.1 The “fall” of electrons during respiration is  stepwise, via NAD   +  and an electron transport  chain Glucose is broken down over a series of steps  that are each catalyzed by a specific enzyme Hydrogen atoms are stripped from the glucose  and usually passed to NAD + .
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APchapter9notes - Chapter 9 notes Cel l ul ar Respi r ati...

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