Cellular Respiration Worksheet

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Cellular Respiration Worksheet

1. What are the 3 phases of the cellular respiration process?

Glycolysis, Krebs Cycle, Electron Transport

2. Where in the cell does the glycolysis part of cellular respiration occur? in the cytoplasm

3. Where in the cell does the Krebs (Citric Acid) cycle part of cellular respiration occur? in the mitochondria

4. Where in the cell does the electron transport part of cellular respiration occur? in the mitochondria

5. How many ATP (net)are made in the glycolysis part of cellular respiration? 2 (net)

6. How many ATP are made in the Kreb’s cycle part of cellular respiration? 2

7. How many ATP are made in the electron transport part of cellular respiration? 32 – 34

8. In which phase of cellular respiration is carbon dioxide made? Krebs Cycle

9. In which phase of cellular respiration is water made?
Electron Transport

10. In which phase of cellular respiration is oxygen a substrate? Electron Transport

11. In which phase of cellular respiration is glucose a substrate? Glycolysis

12. On average, how many ATP can be made from each NADH during the electron transport process? 3

13. On average, how many ATP can be made from each FADH2 during the electron transport process? 2

14. What would happen to the cellular respiration process if the enzyme for one step of the process were missing or defective? The entire process beyond that point could not happen.

15. What happens to the high-energy electrons (and hydrogen) held by NADH if there is no O2 present? If no oxygen is present, the pyruvic acid must take the electrons (and their hydrogens) back.

16. Explain why this happens.
This happens because there are only a small number of NAD+ molecules in the cell. They must be reused to keep glycolysis going with additional glucose molecules. This means they need to “unload” the electrons from NADH by giving them to some other molecule. Since the pyruvic...
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