What is Cellular Respiration?

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What is Cellular Respiration?
energy

• When organisms release the _________ stored in
  carbohydrates and other food molecules

Glucose Fructose Monosaccharides
Sucrose A disaccharide
2
3 stages of Cellular Respiration

• Glycolysis
• Occurs in the cytoplasm
• No O2 required
• Krebs Cycle
• Occurs in the mitochondrion
• Electron Transport Chain
• Requires O2

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Aerobic Respiration

1. Occurs when Oxygen is present
2. Many ATP Molecules made

4
Anaerobic Respiration

• Occurs when no Oxygen is present
• Very little ATP made
• Two basic types
• Fermentation Alcohol and CO2 produced
• Lactic Acid

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Glyco lysis literally means sugar
splitting
ATP
ATP
ADP
ADP
P
P
ATP
-2
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Glycolysis takes place in the cytoplasm
NAD
NADH
P
NAD
NADH
P
NADH
2
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Glycolysis takes place in the cytoplasm
ATP
ADP
P
ATP
ADP
P
ATP
2
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Glycolysis takes place in the cytoplasm
ATP
ADP
P
ATP
Pyruvate
ADP
P
ATP
2
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What is the net gain of energy in Glycolysis?

• ATP 2
• NADH 2

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Moving on to the Krebs Cycle

• Enjoy this video clip, and jot down a summary of
  Krebs and Chances research.
• Pay attention to the significance of both
  scientists discoveries.

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Label the parts of the mitochondrion
Inner membrane
Outer membrane
Inter-membrane space
Cristae
Matrix
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The Krebs Cycle takes place in the Matrix of the
Mitochondrion
NAD
NADH
CoA
Acetyl CoA
NAD
NADH
CoA
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The Krebs Cycle takes place in the Matrix of the
Mitochondrion
CoA
Citrate
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The Krebs Cycle takes place in the Mitochondrion
NAD
NADH
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The Krebs Cycle takes place in the Mitochondrion
NAD
NADH
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The Krebs Cycle takes place in the Mitochondrion
ATP
ADP
P
NADH
NAD
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The Krebs Cycle takes place in the Mitochondrion
FADH
FADH2
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What is gained and lost per pyruvate molecule?

• What is lost during the Krebs Cycle?
• A Carbon atom must be lost
• It is lost in the form of Carbon Dioxide
• There are 3 CO2 molecules lost

• What is gained during the Krebs Cycle?
• 4 NADH molecules are made.
• 1 FADH2 molecule is made
• 1 ATP molecule is made

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What is gained per glucose molecule?

• NADH 4
• ATP 1
• FADH2 1

• But there were two molecules of Acetyl CoA that
  went into the Krebs Cycle
• How many would be produced in this case?

8
2
2
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Where is the energy?

• So far, most of the usable energy from the
  original glucose molecule is stored in and
  
• Where will most of the ATP be made?
• The Electron Transport Chain

NADH
FADH2
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(No Transcript)
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Where is the Electron Transport Chain?
Inside the mitochondrion. Folds of the inner
membrane known as cristae.
Many ATP molecules willbe produced in these
Electron Transport Chains
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How much ATP can each electron carrier make?
ATP
ATP
NADH
ATP
ATP
FADH2
ATP
FADH2
FADH2
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Oxygen is the final electron acceptor. Two
Hydrogen ions attach, and H2O is formed.
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Hydrogen ions pump from the matrix to the inter-
membrane space.
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This uneven distribution of ions is called a
chemiosmotic gradient.
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C6H12O6
ATP
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C6H12O6
CO2
H2O
ATP
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ATP
C6H12O6
CO2
H2O
O2



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Photosynthesis and Respiration

• With a neighbor, fill in the steps in this cycle
  of Photosynthesis and Respiration.
• We will check your answers when you are done!