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10 Cards in this Set
- Front
- Back
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Describe oxidative phosphorylation?
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The method of making ATP’s using the electron transport chain.
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Description of Electron Transport Chain
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Electrons are passed 2 at a time down a chain of electron acceptor molecules to O2 forming H2O; as the electrons are passed energy is released and ATP’s are synthesized.
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Describe chemiosmosis {chemiosmotic phosphorylation }
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As electrons are passed down the electron transport chain, the energy released drives the hydrogen ion pump that moves hydrogen ions from the mitochondrial matrix into the intermembranous space { between the inner and outer membranes of the mitochondria }.
The hydrogen ion concentration is now greater in the outer compartment. This concentration gradient and electrical gradient causes hydrogen ions to move through hydrogen channels { ATP synthase complex } in the inner membrane. Energy associated with the flow of these hydrogen ions through these channels is used to synthesize ATP from ADP and P. |
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How many electrons are PASSED along the chain per glucose molecule?
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24 electrons are passed along the chain.
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List the 3 sources of these electrons.
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a. The 2 NADH’s formed during glycolysis{source of 4 electrons}.
b. The 2 NADH’s formed during the oxidation of the 2 pyruvic acid molecules{source of 4 electrons} c. The 6 NADH’s and 2 FDH2 ‘s formed with 2 turns of the Krebs cycle{source of 16 electrons}. |
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How many ATP's are SYNTHESIZED
per glucose molecule? |
32 ATP’s.
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What is the role of O2?
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It is the final electron acceptor.
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In what part of the cell does this process occur?
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In the inner membranes of the mitochondria.
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What is the net ATP production for the COMPLETE respiration of one molecule of glucose?
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36 ATP’s.
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How efficient is the process of cellular respiration of glucose?
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It is about 39% efficient. A glucose molecule contains 686 kilocalories, and each ATP contains 7.5 kilocalories. So 36ATP’s contain 270 kilocalories{36X 7.5}, which is 39% of 686.
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