cellular respiration chapter 9 textbook pages 220-239 study guide pages 70-76
TRANSCRIPT
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Cellular Respiration
Chapter 9
Textbook Pages 220-239
Study Guide Pages 70-76
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Looking Ahead…Today: Begin Cellular RespirationTomorrow: Glycolysis/FermentationFriday: Open notes quiz
Short class (due to assembly) Start work on Krebs cycleMonday: No SchoolTuesday: Finish Krebs cycle and electron
transportWednesday:Compare/Contrast Photosynthesis
and Cell Resp.Thurs & Fri: You’ll have a sub.
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Who/What needs food?
PeopleAnimalsPlantsBacteriaFungiAll living things
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Energy comes from Sugars (or complex starches)…
One gram of sugar can produce 3811 calories of heat energy
1000 calories of heat energy = 1 kilocalorie (labeled as Calorie with a capital “C” on our food products)
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Pulling Energy from Sugar
How do organisms get energy from sugar?
Cellular Respiration!Occurs in the mitochondrionBegins with glycolysisFood is broken down in the presence of
oxygen!
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What is Cellular Respiration?
The process that releases energy by breaking down food molecules in the presence of oxygen
6O2 + C6H12O6 6CO2 + 6H2O + energy
Oxygen + glucose carbon dioxide + water + energy
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Steps of Cellular Respiration
Glycolysis (cytoplasm)
Krebs Cycle (mitochondria)
Electron Transport Chain (mitochondria)
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Cell Resp.
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Project…
Use the Handout to cut out the stages of Cellular Respiration.
Paste cycle on a piece of paper to put in your binder
Label cytoplasm and mitochondrionAdd arrowsMake it colorful and fun!
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Daily Warm Up…The three stages of cellular respiration, in
order, are _________, ________, and __________.
The equation for cellular respiration is ___ + ___ _____ + _____ + ______
What are the reactants?What are the products?HOTS: Cellular respiration is called aerobic
respiration because _________ must be present as the final acceptor of electrons.
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HOTS Higher Order Thinking Skills
HOTS: Cellular respiration is called aerobic respiration because oxygen must be present as the final acceptor of electrons.
**When you’re doing aerobics, you breathe more rapidly, because you need more oxygen!!**
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GlycolysisProcess in which one molecule of glucose is
broken in half, producing 2 molecules of pyruvic acid
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Using the jumper cables…
In order to get things going, 2 ATP molecules are used to “jump start” the glycolysis process
Once things get rolling…
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Making energy…
Glycolysis can produce 4 ATP molecules and 2 NADH molecules
NADH works just like NADPH… think of it as the prison transport van… Each NAD+ can transport 2 high-energy
electrons, or “prisoners” and one H+ ion, or “prison guard”
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Faster than driving on the Autobahn…
Glycolysis moves super fast…So fast, in fact, that the cell can produce
thousands of ATP molecules in just a few miliseconds!
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Fermentation No oxygen around? Cells then rely on fermentation to release
energy from food. No oxygen = anaerobic NADH is converted to NAD+ by giving the 2 electrons and H+
ion to the pyruvic acid
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2 Types of Fermentation:
Alcoholic fermentationYeast (bread)Some microorganismsPyruvic acid + NADH alcohol + CO2 + NAD+
Lactic acid fermentationWhy your muscles burn
sometimes when you exercisePyruvic acid + NADH lactic acid + NAD+