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Cellular Respiration Review Sheet
Name:___________________
1. Cellular respiration takes glucose from the food we eat and converts it to cellular energy
molecules called ___ATP__________.
2. The process of cellular respiration takes place in the __mitochondria_______ and
___cytoplasm_______ of the cell?
4. ___Aerobic__________ respiration uses oxygen, while ____anaerobic______ respiration
does not require oxygen.
5. In order, name the three steps of aerobic respiration A.___Glycolysis_______,
B.____Krebs cycle__________, C._______Electron Transport Chain_______.
6. How is pyruvic acid modified before the Krebs cycle?
Pyruvic acid (3 carbon) is converted to acetyl-CoA (2 carbon), a compound that starts
Krebs by joining with a 4 carbon compound already within the cycle. The four carbon
compound and acetyl-CoA create citric acid.
8. The waste product from the Krebs cycle that we exhale is __CO2____.
9. The Krebs cycle occurs in the ___matrix_______ of the mitochondria.
11. Label the cristae and matrix of the mitochondria shown below.
cristae
matrix
12. Where does the electron transport chain process take place?
On the inner membrane of the mitochondria.
13. During which phase of cellular respiration is the most ATP made?
ETC = 32
17. If no oxygen is present, glycolysis is followed by __fermentation_______.
18. Fermentation can result in the production of __alcohol _____ OR _____lactic acid_____.
19. Why do your muscles burn during intense exercise?
Not enough oxygen is reaching your cells; therefore your cells undergo lactic acid fermentation.
Lactic acid accumulation in the muscle tissue causes soreness.
20. Cellular respiration uses glucose and oxygen to produce __CO2______ and ____H2O_____
along with ATP.
21.Write the equation for cellular respiration and photosynthesis.
C6H12O6 + 6O2 ------------ 6H2O + 6CO2 + ATP
6CO2 + 6H2O + Light --------- C6H12O6 + 6O2
22. Electron carriers called __NADH_______ and ___FADH2______ from the Krebs cycle carry
electrons to the electron transport chain, the last step of aerobic cellular respiration.
23. Glycolysis breaks a C _6__ glucose molecule down into two C 3 molecules called __Pyruvic
Acid (pyruvate)_________.
24. The electron entering the electron transport chain powers protein pumps which pump
_hydrogen____ in to the inner membrane space.
25. Hydrogen re-enters the matrix of the mitochondria through __ATP synthase______, a
protein that manufactures ATP.
26. Lactic acid and alcohol fermentation both start with the reactants __pyruvic acid_____ and
__NADH_____.
27. Glycolysis must happen before __fermentation________ can happen anaerobically.
28. After electrons have traveled through the ETC they are accepted by __oxygen____ and join
with hydrogen to form the waste product _water_____.
29. What would be the problem if cellular respiration took place in just one step?
Most of the energy stored in the glucose molecule would be lost as light and heat.
30 A __calorie____ is used to measure the amount of energy it takes to raise 1 gram of water 1
degree Celsius.
31. What is the function of NAD+ as a product in fermentation?
NAD+ cycles back to glycolysis and enables the glycolysis reaction to proceed by
serving as an electron carrier (NADH). NADH then combines with pyruvic acid to keep
fermentation going.
32. In terms of oxidation and reduction, NAD+ is _oxidized_____, while FADH2 is
___reduced______.