cellular respiration notes. pre-quiz 1.in what organelle does cellular respiration take place?...
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Cellular Respiration Notes
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Pre-Quiz
1. In what organelle does cellular respiration take place?
a. Chloroplast
b. Nucleus
c. Mitochondria
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Pre-Quiz
2. Does aerobic respiration require oxygen?
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Pre-Quiz
3. Which of the following is not part of cellular respiration?
a. Calvin Cycle
b. glycolysis
c. modification of pyruvate
d. electron transport chain
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Pre-quiz
4. How many ATP are made during aerobic respiration?
a. 2
b. 8
c. 32
d. 36
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Pre-Quiz
5. What causes muscle fatigue?a. Aerobic respiration
b. Lactic acid fermentation
c. Alcoholic fermentation
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Cellular Respiration
• The process by which mitochondria break down food molecules to produce ENERGY (ATP)!
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Aerobic Respiration (with Oxygen)
• Exists in 4 Stages1.Glycolysis
2.Modification of Pyruvate
3.Citric Acid Cycle / Krebs Cycle
4.Electron Transport Chain
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Glycolysis
• Breaking down glucose– Occurs in the cytoplasm of the cell.– chemical reactions that break down glucose in to 2
pyruvates.– 2 ATP are used and 4 ATP are produced = net gain
of 2 ATP.
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Modification of Pyruvate• Pyruvate is changed into Acetyl Co-A• Occurs in the mitochondria• Products:
– 1 CO2
– 1 NADH which is an electron carrier.
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Citric Acid Cycle / Krebs Cycle
• 1 Glucose = 2 turns of the cycle.
• Products:– 2 More CO2
– More electron carriers (3 NADH & 1 FADH2)
– 1 ATP produced per turn.
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Kreb’s Cycle
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Electron Transport Chain• Electron carriers pass
electrons from protein to protein in the inner membrane of the mitochondria.
• This forms ATP!• The electron is
accepted by oxygen and water is produced.
• This chain produces 32 ATP.
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ETC (Electron Transport Chain)
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ATP Synthesis
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Overall Equation for Cellular Respiration
• C6H12O6 + 6O2 6CO2 + 6H2O + energy
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Overall Energy Output (for aerobic respiration):
• 2 ATP from Glycolysis• 2 ATP from Krebs Cycle• 32 ATP from Electron Transport Chain• 36 ATP Total • Animation
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Anaerobic Respiration (with out Oxygen)
• Lactic Acid Fermentation– used by animals and some plants
(cells) when the electron transport chain backs up due to lack of oxygen.
– produces a byproduct known as lactic acid (toxic to cells)
– Results in muscle fatigue.
– Only get 2 ATP from this process.
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Anaerobic Respiration (with out Oxygen)
Alcoholic Fermentation• used by yeast as
well as others to produce CO2 and ethyl alcohol.