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 → carbon dioxide + water + ATP
Anaerobic (alcohol fermentation): Glucose→ ethanol alcohol + carbon dioxide
Anaerobic (lactate formation): Glucose → lactic acid
3. What are the 2 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 & electron transport chain part of cellular respiration
occur? Why?
Kreb’s cycle = Mitochondrial matrix; the necessary enzymes are located there
ETC = Mitochondrial membrane/cristae; increased surface area for more ATP production
6. How many ATP are made in the glycolysis part of cellular respiration?
2
7. How many ATP are made in the Kreb’s cycle & electron transport chain part of cellular respiration?
Kreb’s cycle = 2 & ETC = 32
8. In which phase of cellular respiration is carbon dioxide made?
Kreb’s cycle
9. In which phase of cellular respiration is water made?
ETC
10. 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
11. Where does the process of fermentation take place?
Cytoplasm
12. What are the products of lactate fermentation?
Lactic acid
13. What are the products of ethanol fermentation?
Ethanol and carbon dioxide
14. Draw and label a mitochondrion and include all of the parts that are used during cellular respiration.
Crista (plural cristae)