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Cellular Respiration
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Harvesting Chemical Energy So we see how energy enters food chains (via
autotrophs) we can look at how organisms use that energy to fuel their bodies.
Plants and animals both use products of photosynthesis (glucose) for metabolic fuel
Heterotrophs: must take in energy from outside sources, cannot make their own e.g. animals
When we take in glucose (or other carbs), proteins, and fats-these foods don’t come to us the way our cells can use them
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When we take in glucose (or other carbs), proteins, and fats-these foods don’t come to us the way our cells can use themAnimals use cellular respiration to transform
chemical energy in food into chemical energy cells can use: ATP
These reactions proceed the same way in plants and animals.
Overall Reaction: C6H12O6 + 6O2 → 6CO2 + 6H2O
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How much energy is actually present in food? 1 g of sugar glucose (C6H12O6) when burned in
the presence of O2 releases 3811 calories of heat energy
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How many calories do you burn a day?
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How many calories do you burn a day? Male 150 lb 5’9” Somewhat active Burns 3023 kcal a day or 3023 Calories or
3,023,000 calories
1 g of glucose produces 3811 calories
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Calorie calorie: The amount of energy needed to raise the
temperature of 1 gram of water 1 degree Celsius
Calorie: food labels 1000 calories Cells don’t burn glucose – cells gradually release
energy from glucose and other food compounds Cells release energy from glucose by performing
cellular respiration
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Cellular Respiration Overview Breakdown of glucose begins in the cytoplasm:
the liquid matrix inside the cell At this point life diverges into two forms and two
pathways Anaerobic cellular respiration (aka fermentation) Aerobic cellular respiration
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Cellular Respiration Cellular respiration is the process that releases
energy by breaking down glucose and other food molecules in the presence of oxygen
C6H12O6 + 6O2 → 6CO2 + 6H2O
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Cellular Respiration Glycolysis The Krebs Cycle Electron Transport
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Glycolysis The process in which one molecule of glucose is
broken in half, producing two molecules of pyruvic acid
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http://upload.wikimedia.org/wikipedia/commons/1/17/Glycolysis2.svg
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Glycolysis – ATP Production 2 ATP used 4 ATP produced
Net gain of 2 ATP
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Glycolysis – NADH Production NAD+ accepts a pair of high-energy electrons
until they are transferred to other molecules
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Anaerobic Respiration When oxygen is not present, glycolysis is followed
by a different pathway – FERMENTATION
Alcoholic fermentation (yeast) Pyruvic acid + NADH alcohol + CO2 + NAD+ Causes bread to rise – CO2 forms the air spaces that
you see in bread Lactic acid fermentation (muscles)
Pyruvic acid + NADH lactic acid + NAD+
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Substrate Level Phosphorylation
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Glycolysis
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Krebs Cycle
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Citric Acid Production Pyruvic acid enters the mitochondrion A carbon is removed, forming CO2 Electrons are removed: NAD+ NADH Coenzyme A joins the 2-carbon molecule, forming
Acetyl-Co-A Acetyl-Co-A then adds the 2-carbon acetyl group
to a 4-carbon compound (oxaloacetate), forming Citric Acid
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Krebs Cycle
Cytoplasm
Inner Mitochondrial Space
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Acetyl Co A Citric Acid
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Energy Extraction Citric acid is broken down into a 5-carbon
compound, then into a 4 carbon compound Produces
2 more molecules of CO2 NAD+ NADH FAD+ FADH2 1 ATP
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Electron Transport Electrons from NADH and FADH2 are used in the
electron transport chain to convert ADP to ATP
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Electron Transport Chain Composed of carrier proteins located in the inner membrane of
the mitochondrion High-energy electrons are passed from one carrier protein to the
next An enzyme combines these electrons with hydrogen ions and
oxygen H2O Oxygen is the final electron acceptor of the electron transport chain Oxygen is essential for getting rid of low-energy electrons and
hydrogen ions Low-energy electron and hydrogen ions are waste products of cellular
respiration
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Hydrogen Ion Movement Every time 2 high-energy electrons transport down
the electron transport chain, their energy is used to transport hydrogen ions (H+) across the membrane
H+ build up in the intermembrane space, making it positively charged
The other side of the membrane is negatively charge
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ATP Production The cell uses the build up of charge differences As H+ escape through the ion channels, the ATP
synthase (a protein enzyme) spins Each time the ATP synthase spins, the enzyme
grabs an ADP and attaches a phosphate, forming ATP
Each pair of high-energy electrons that moves down the electron transport chain provides enough energy to produce three molecules of ATP
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