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Cards In This Set
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At the end of glycolysis, how much of chemical energy in glucose is left over?
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About 90 percent is still used.
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Because the final stages of cellular respiration require oxygen, they are said to be?
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Aerobic.
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In the presence of oxygen, how is the pyruvic acid produced in glycolysis used?
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It passes to the second stage of cellular respiration, the krebs cycle.
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What happens to pyruvic acid during the krebs cycle?
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It is broken down into carbon dioxide in a series of energy-extracting reactions.
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Why is the the krebs cycle also known as the citric acid cycle?
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Citric acid is the first compound formed in this series of reactions.
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When does the krebs cycle begin?
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It begins when pyruvic acid is produced by glycolysis enters the mitochondrion.
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What happens to each of the 3 carbon atoms in pyruvic acid when it is broken down?
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One carbon atom becomes part of a molecule of carbon dioxide. Two of the carbon atoms are joined to a compound called coenzyme A to form acetyl-CoA.
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What happens to the carbon dioxide produced in breaking down pyruvic acid?
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It is released into the air.
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How is citric acid produced?
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Acetyl-CoA addds the 2-carbon acetyl group to a 4-carbon molecule, producing a 6-carbon molecule called citric acid.
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During the energy extraction part of the krebs cycle, how many molecules of CO2 are released?
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Two molecules are released.
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What is the energy tally from 1 molecule of pyruvic acid during the krebs cycle?
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It is 4 NADH molecules, 1 FADH2 molecule,and 1 ATP molecule.
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When electrons join NAD+ and FAD during the krebs cycle, what do they form?
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They form NADH and FADH2.
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Why is it that 4-carbon compond generated in the breakdown of citric acid the only permanent compound in the krebs cycle?
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It is regenerated at the end of each complete turn of the cycle.
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What is the electron transport chain?
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It is a series of proteins in the inner membrane of mitochondria.
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What does the electron transport chain use the high-energy electrons from the krebs cycle for?
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The chain uses the electrons to convert ADP into ATP.
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