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Q&A Ch. 9

Biology Q&A Chapter 9

QuestionAnswer
Where do organisms get energy? Organisms get the energy they need from food.
What is cellular respiration? Cellular respiration is the process that releases energy from food in the presence of oxygen.
What is the relationship between photosynthesis and cellular respiration? Photosynthesis removes carbon dioxide from the atmosphere, and cellular respiration uses that oxygen to release energy from food.
What happens during the process of glycolysis? During glycolysis, 1 molecule of glucose, a 6-carbon compound, is transformed into 2 molecules of pyruvic acid, a 3-carbon compound.
What happens during the Krebs cycle? During the Krebs cycle, pyruvic acid is broken down into carbon dioxide in a series of energy-extracting reactions.
How does the electron transport chain use high-energy electrons for glycolysis and the Krebs cycle? The electron transport chain uses the high-energy electrons from glycolysis and the Krebs cycle to convert ADP into ATP.
How much ATP does cellular respiration generate? Together, glycolysis, the Krebs cycle, and the electron transport chain release about 36 molecules of ATP per molecule of glucose.
How do organisms generate energy when oxygen is not available? In the absence of oxygen, fermentation releases energy from food molecules by producing ATP.
How does the body produce ATP during different stages of exercise? For short, quick bursts of energy, the body uses ATP already in muscles as well as ATP made by lactic acid fermentation. For exercise longer than about 90 seconds, cellular respiration is the only way to continue generating a supply of ATP.
Created by: Perseus99
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