1. What are the 3 phases of the cellular respiration process? - The three phases of cellular respiration are glycolysis, citric acid cycle, oxidative phosphorylation. 2. Where in the cell does the glycolysis part of cellular respiration occur? - It takes part in cytosol. 3. Where in the cell does the Krebs (Citric Acid) cycle part of cellular respiration occur? - Citric Acid cycle takes place in the mitochondria. 4. Where in the cell does the electron transport part of cellular respiration occur? - It takes place in the mitochondria. 5. How many ATP (net) are made in the glycolysis part of cellular respiration? - 2 ATP molecules are made in the glycolysis part. 6. How many ATP are made in the Kreb’s cycle part of cellular respiration? - There are 34 ATP molecules that are made in the Kreb’s cycle. 7. How many ATP are made in the electron transport part of cellular respiration? - There can be up to 38 molecules of ATP that can be produced in the electron transport. 8. In which phase of cellular respiration is carbon dioxide made? - Carbon dioxide is made in the Krebs Cycle. 9. In which phase of cellular respiration is water made? - Water is made in the final stage of cellular respiration during the electron transport chain. 10. In which phase of cellular respiration is oxygen a substrate? - Oxygen is a substrate in the electron transport. 11. In which phase of cellular respiration is glucose a substrate? - The phase that glucose is glycolysis. 12. On average, how many ATP can be made from each NADH during the electron transport process? - 3 ATP can be produced. 13. On average, how many ATP can be made from each FADH2 during the electron transport process? - 2 ATP can be produced. 14. What would happen to the cellular respiration process if the enzyme for one step of the process were missing or defective? - If one of the steps went missing or defective the entire process beyond that step would not be able to happen. 15. What happens to the high-energy electrons (and hydrogen) held by NADH if there is no O2 present? - If no O2 is present, pyruvic acid must take the electrons back, as well as the hydrogens that go along with the electrons. 16. Explain why this happens. This happens because there is no oxygen to accept electrons, that results in electron chain to stop working and high energy NADH+H and FADH2 cannot be converted back into NAD AND FAD. The whole cycle stops. 17. What is the overall reaction for fermentation in yeast? - The overall reaction produces 2 moles of ATP in the process, from one mole of glucose into two moles of ethanol and two moles of carbon dioxide. 18. What is the overall reaction for lactic acid fermentation? - Glucose is broken down by glycolysis into 2 pyruvates and then those two pyruvates are fermented to produce 2 lactic acid molecules. 19. Only a small part of the energy released from the glucose molecule during glycolysis is stored in ATP. How is the rest of the energy released? (HINT: It is a product in the overall reaction for cellular respiration.) - The rest of the energy is released as heat.

Cellular Respiration Worksheet

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