Honors Biology: Cellular Respiration Worksheet
1. What are the 2 metabolic pathways a cell can use and what determines which pathway is used?
Aerobic respiration & anaerobic respiration; they depend on the presence or absence of oxygen
2. Write the overall equation for cellular respiration.
Aerobic: Glucose + oxygen yields carbon dioxide + water
Anaerobic (alcohol fermentation): Glucose→ ethanol alcohol + carbon dioxide
Anaerobic (lactate formation): Glucose → lactic acid
3. What are the 3 phases of the cellular respiration process?
Aerobic: Glycolysis & Kreb’s cycle/electron transport chain
Anaerobic: Glycolysis & Lactate Formation or Alcohol Feremntation
4. Where in the cell does the glycolysis part of cellular respiration occur? Why?
Cytoplasm; the necessary enzymes are located there
5. Where in the cell does the Krebs (Citric Acid) cycle part of cellular respiration occur? Why?
Mitochondrial matrix; the necessary enzymes are located there
6. Where in the cell does the electron transport part of cellular respiration occur? Why?
Mitochondrial membrane/cristae; increased surface area for more ATP production
7. How many ATP are made in the glycolysis part of cellular respiration?
2
8. How many ATP are made in the Kreb’s cycle part of cellular respiration?
2
9. How many ATP are made in the electron transport part of cellular respiration?
32
10. In which phase of cellular respiration is carbon dioxide made?
Kreb’s cycle
11. What are NAD+ and FAD? What do they do and what do they become?
They are electron carriers in the ETC; they become NADH and FADH2
12. In which phase of cellular respiration is water made?
ETC
13. What would happen to the cellular respiration process if the enzyme (aka catalyst) for one step of the process was
missing or defective?
The process would stop and no more products would be made
14. Where does the process of fermentation take place?
cytoplasm
15. What are the products of lactate fermentation?
Crista (plural cristae)
Lactic acid
16. What are the products of ethanol fermentation?
Ethanol and carbon dioxide
17. Draw and label a mitochondrion and include all of the parts that are used during cellular respiration.
Answer given and labeled picture given above