Cellular Respiration Worksheet:
1. What is the purpose of cellular respiration?
2. What is the formula for cellular respiration?
3. What molecule does the glucoses come from that are part of normal cellular
respiration of a cell? What two types of cells are especially good at storing
this molecule? What happens to this molecule if it is not consumed in cellular
respiration in a timely manner?
4. Looking at the four stages of cellular respiration, which ones produce carbon
dioxide?
5. Where is the oxygen consumed in cellular respiration?
6. If we use radioactive oxygen so that we can trace where it goes, where would
you find the oxygen after it is consumed in cellular respiration? (in what
location and in what molecule.)
7. What happens in the investment phase of glycolysis? (what is gained/lost)
8. What happens in the payoff phase of glycolysis? (what is gained/lost)
9. Why is glucose split into two three carbon molecules in glycolysis?
10. What are the final products of glycolysis? (outputs)
11. Where are the oxidation reactions and where are the reduction reactions
taking place during glycolysis?
12. Describe the three process that occur during the transition reaction? What is
the role/importance of adding coenzyme A to the carbons moving on?
13. How many cycles of the citric acid cycle are needed to consume the carbons
of one glucose molecule?
14. Where does the citric acid cycle get its name?
15. How many carbon atoms enter the Citric Acid Cycle? What is their ultimate
fate?
16. When the carbons leave the Citric Acid Cycle, what molecule accepts the
electrons to pass on to the ETC? Are the carbons oxidized or reduced when
they leave the Citric Acid Cycle? (Hint: Are they higher or lower in energy?)
17. What is the name of the process that makes ATP directly during glycolysis,
transition reaction, and Citric Acid Cycle? Is the ATP oxidized or reduced?
Explain.
18. How many ATP, NADH, and FADH2 are produced from one cycle of the Citric
Acid Cycle? How many of each are produced from one glucose molecule?
Why are these numbers not the same? Explain.
19. Were the NADH and FADH2 reduced or oxidized during the Citric Acid Cycle?
How do you know?
20. When the NADH and FADH2 release their electrons into the ETC, are they
oxidized or reduced? Is this the same as the above answer? Why or why not?
21. How many hydrogen (1 per membrane protein) are pumped into the
intermembrane space as a result of one NADH? One FADH2? Why do they
pump a different amount of hydrogen into the intermembrane space?
22. What happens within the intermembrane space as the hydrogen is being
pumped into it? What is this called? (2 separate names)
23. What happens to the hydrogen eventually? (What enzyme does it pass
through and what does this enzyme generate?)
24. What molecule is the final electron acceptor in the electron transport chain?
What product is formed when this happens?
25. What is the process that generates the ATP from the ETC called?
26. What would happen if the outer membrane of the mitochondria were
punctured or had a hole in it?
27. When you exercise, where do you get your initial ATP? Is this aerobic or
anaerobic?
28. If you continued to exercise, where do you get the majority of your ATP? Is
this aerobic or anaerobic?
29. Eventually you will run out of stored glucose. Where does your cell get
energy from when this happens?
30. At what stage does this alternative energy source enter cellular respiration?
Why here?
31. When you train for an upcoming event such as track, lacrosse, or swimming,
what are you actually doing in terms of cellular respiration?
32. If you take a few days off from your training, your body is not prepared to do
cellular respiration at the same rate that you did when you were maximizing
your training. What substance is actually running out faster during your
training session? What impact does this have on cellular respiration?
Explain.
33. What substance is going to be formed as a result of question 32? What is this
process called? How does your body get rid of it and why is it necessary that
this substance was formed in the first place?
34. Bacteria lack mitochondria. They do alcohol fermentation. What is the
purpose of this process?
35. Explain the phrase “Freshman 20”. Why does this occur and how can you
avoid it?