Cellular Respiration Web Activity
Name: _______________
Directions: Go to the following website: http://www.sumanasinc.com/webcontent/animations/content/cellularrespiration.html
Click on The Big Picture button at the bottom of the screen. Watch and listen carefully to the animation. Answer the following
questions. You may press the pause button at any time or drag the cursor back to see something again. Make sure you understand
every question. Continue on through all sections.
The Big Picture
1. Why do all living things go through cellular respiration, ie, what is the purpose of cellular respiration?
2. What are the reactants of cellular respiration?
3. What are the products of cellular respiration?
4. What is the overall equation for cellular respiration?
5. How are cellular respiration and photosynthesis related to
each other?
6. What are the three stages of cellular respiration?
Glycolysis
7. Checkpoint: Where in the cell does glycolysis take place?
8. How many ATP molecules are required as an input into
glycolysis?
9. How many ATP molecules are produced from glycolysis?
10. Checkpoint: Glycolysis results in the breakdown of one _______molecule into two smaller __________
molecules.
11. What is the net yield of ATP molecules in glycolysis?
12. What is the net yield of NADH molecules in glycolysis?
Krebs Cycle
13. Where in the cell does the Krebs Cycle occur?
14. When pyruvate enters the mitochondrion, one of its carbon atoms becomes a part of a molecule of
_________, which is released into the air, while the other two carbon atoms join coenzyme-A to become
___________. Two high-energy electron carrier molecules, called ___________ are also created.
15. Checkpoint: What is the difference between NAD+ and NADH?
16. Checkpoint: After the Krebs Cycle, all of the carbon atoms from the original glucose molecule are
_________?
17. How many ATP molecules are created from the two pyruvate molecules that enter the Krebs cycle?
18. How many NADH molecules are created from the two pyruvate molecules that enter the Krebs cycle?
19. Checkpoint: What is the function of NADH?
20. Checkpoint: Why is an increase in the number of mitochondria beneficial for aerobic exercise?
Electron Transport Chain
21. What is the main purpose of the electron transport chain?
22. In what part of the mitochondria does the electron transport chain
occur?
23. Checkpoint: What is the function of the electrons carried to the chain
by NADH and FADH2?
24. Checkpoint: What is a concentration gradient?
25. How is the oxygen that we breathe involved in the
electron transport chain?
26. At the end of the electron transport chain, oxygen gas
accepts electrons and
then
combines with protons to form _____.
27. Checkpoint: What is the purpose of the proton
gradient in the electron transport
chain?
28. Checkpoint: What happens to the electron transport
chain of oxygen is lacking?
29. Checkpoint: What is the overall purpose of cellular respiration?
30. Checkpoint: How does cyanide block the function of the electron transport chain?