Name ______________________________
Period _________
Unit 3, Part 1 Review Packet
Part 1: Overview, Chloroplasts and Light-Dependent Reactions
1. What occurs during the process of photosynthesis? (Summarize in one sentence)
2. Write the overall equation for photosynthesis using chemical formulas.
3. What does photosynthesis require in addition to water and carbon dioxide?
4. List the two stages of photosynthesis and briefly summarize their role in the process:
a. _______________________________________________________________
b. _______________________________________________________________
5. Plants gather the sun’s energy with light-absorbing molecules called _________________.
6. ______________________________, the principal pigment involved in photosynthesis
reflects ___________________ light and absorbs ______________________ light.
7. Chloroplasts contain saclike photosynthetic membranes called ___________________.
8. What are grana?
9. The region outside the thylakoid membranes in chloroplasts is called the______________.
10. Energy from the sun is absorbed when sunlight excites the __________________ in
chlorophyll molecules to a higher energy level.
11. Circle the electron carrier molecule involved in photosynthesis.
a. H2O
c. CO2
b. NADP+
d. O2
12. Where do the light-dependent reactions take place? Be specific!
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13. Explain how oxygen gas is involved in the light-dependent reactions.
14. What is the role of the electron transport chain in the light-dependent reactions?
15. What are the products of the light-dependent reactions?
16. Why is ATP produced in the light reactions?
17. What is the overall purpose of the light-dependent reactions? (I know you answered this
above, but try again without looking!)
18. For the following statements, circle the letter of each sentence that is true about the lightdependent reactions. For statement(s) that are not true, make corrections as necessary and
write the correct statement in the space provided.
a. They make ATP as energy is stored.
b. They release oxygen gas.
c. They release carbon dioxide.
d. They convert NADP+ into NADPH to store high-energy electrons.
e. They take place in the stroma.
f. Carbon dioxide is used to replace the electrons.
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Part 2: The Calvin Cycle
1. The Calvin cycle take place in the _________________________ of the chloroplast.
2. What substances store the energy needed for the Calvin cycle? Where do they come
from?
3. What happens to CO2 in the Calvin cycle?
4. Why do you think the reactions of the Calvin cycle also called the light-independent
reactions?
5. The enzyme ___________________ is used during the process of carbon fixation to join
CO2 to RuBP.
6. Circle the letter of each statement that is true about the Calvin cycle. Correct the false
statements.
a. The main products of the Calvin cycle are oxygen and water.
b. The main purpose of the Calvin cycle is to make ATP.
c. Energy from ATP and high-energy electrons from NADPH are used to help make
sugar.
d. The Calvin cycle uses carbon dioxide to produce a glucose molecule.
7. What are the products of the Calvin cycle?
8. Where do the ADP and NADP+ go after being produced?
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9. Why is it so important to make glucose? How is it used by living organisms?
10. What two enzymes are used in photosynthesis? (one in the light-dependent reactions and
the other in the Calvin cycle)? What is their role in the process?
11. Complete the illustration of the overview of photosynthesis below by writing the products
and the reactants of the process, as well as the energy source that excites the electrons.
The names of the two groups of reactions can be placed on the area of the chloroplast in
which they occur. You will use the following words: light, H2O, NADPH, NADP+, lightdependent reactions, Calvin Cycle, O2, CO2, ATP, ADP + P, G3P, glucose
Modified from:
http://www.strathmorehighschool.com/docs/homework/16%20%20PS%20worksheet.doc
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Part 3: Overview of Cellular Respiration, Glycolysis and Anaerobic Respiration
1. What is the overall purpose of cellular respiration?
2. The energy from the food molecules (still in the electrons) is ultimately used to make
_______________________.
3. Cellular respiration with oxygen is called _____________________________ respiration
and cellular respiration without oxygen is called ________________________respiration.
4. What is the balanced chemical equation for aerobic respiration?
5. What step starts both aerobic and anaerobic respiration?
6. This step begins by breaking down ____________________ into __________________.
7. The main products of this step are _____________________ , ______________________,
and___________________.
8. Why does anaerobic respiration occur?
12. Compare and contrast the 2 types of anaerobic respiration. List 4 similarities and 2
differences. Use the chart below:
Type of Anaerobic
Respiration
Lactic Acid Fermentation
Alcoholic Fermentation
Similarity
Similarity
Similarity
Similarity
Difference
Difference
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13. Why does bread rise?
14. What causes muscle fatigue? Would muscle fatigue more likely occur in a marathon
runner or a sprinter? Why?
Part 4: Krebs Cycle and Electron Transport Chain/Comparison of Photosynthesis and
Aerobic Respiration
1. What is the purpose of the Krebs Cycle?
2. Prior to entering the Krebs cycle, pyruvic acid is changed to _______________________
and moved into the ________________________________.
4. During the Krebs cycle, what substance is released? ______________________
5. How are electrons stored during the Krebs Cycle?
7. What is the purpose of the Electron Transport Chain (ETC)?
8. Why does aerobic respiration need oxygen? What happens if oxygen is not present?
9. What gas is released during the ETC? Why?
13. What stores more energy – ATP or glucose? ____________________________
10. When would a human use aerobic respiration? When would a human use anaerobic
respiration? Why??
14. List 4 differences and 4 similarities between aerobic cellular respiration and
photosynthesis.
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