AP Biology 2007-2008 Cellular Respiration Harvesting Chemical Energy ATP.
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Transcript of AP Biology 2007-2008 Cellular Respiration Harvesting Chemical Energy ATP.
AP Biology 2007-2008
Cellular RespirationHarvesting Chemical Energy
ATP
AP Biology
Cellular RespirationStage 1:
Glycolysis
AP Biology
Cellular respiration is a process which generates energy in living things.
It extracts stored energy from glucose to form ATP.
The energy stored in ATP can then be used to drive processes requiring energy, including bio-synthesis, locomotion or
transportation of molecules across cell membranes..
There are two types of cellular respiration:
AEROBIC(requires Oxygen)
• Glycolysis• Krebs Cycle• Electron Transport Chain
ANAEROBIC/Fermentation(without Oxygen)
• Glycolysis• Lactic Acid Fermentation
or• Alcoholic Fermentation
AP Biology
Glycolysis
glucose pyruvate2x6C 3C
That’s not enoughATP for me!
Breaking down glucose “glyco – lysis” (splitting sugar)
This is the beginning stage for both aerobic/anaerobic It’s inefficient
generate only 2 ATP for every 1 glucose occurs in the cytoplasm of the cell
right outside the mitochondria
AP Biology
Begins With..
Ends With.. , 2 NADH,
AP Biology
Energy Input Steps
AP Biology
Energy Releasing Steps
Now Unstable
AP Biology
Energy Releasing Steps, cont.
Now Unstable
AP Biology
Convert: glucose (6C) to 2 pyruvate (3C)
produces: 4 ATP & 2 NADH
consumes:2 ATP
net yield: 2 ATP & 2 NADH
Key Points
ATP2
2
AP Biology
Pyruvate is a branching pointPyruvate
O2O2
mitochondriaKrebs cycle
aerobic respiration
fermentationanaerobicrespiration
AP Biology
Glycolysis summary endergonicinvest some ATP
exergonicharvest a little ATP & a little NADH
net yield2 ATP2 NADH
4 ATP
ENERGY INVESTMENT
ENERGY PAYOFF
G3PC-C-C-P
NET YIELD
like $$in the bank
-2 ATP