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?

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

Crista (plural cristae)