light and absorbs ______________________ light. Unit 3 Review Packet

Unit 3 Review Packet
Part 1: Overview, Chloroplasts and Light-Dependent Reactions
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What occurs during the process of photosynthesis? (Summarize in one sentence)
Write the overall equation for photosynthesis using chemical formulas.
What does photosynthesis require in addition to water and carbon dioxide?
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!
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 light-dependent 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.
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.
• The main products of the Calvin cycle are oxygen and water.
• The main purpose of the Calvin cycle is to make ATP.
• Energy from ATP and high-energy electrons from NADPH are used to help make sugar.
• 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?
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?
Mrs. Rippin Page 1 of 3 9/19/13 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+,
light-dependent reactions, Calvin Cycle, O2, CO2, ATP, ADP + P, G3P, glucose
Modified from:
http://www.strathmorehighschool.com/docs/homework/16%20%20PS%20worksheet.doc
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?
9. 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
10. Why does bread rise?
11. What causes muscle fatigue? Would muscle fatigue more likely occur in a marathon runner or a sprinter? Why?
Mrs. Rippin Page 2 of 3 9/19/13 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
________________________________.
3. During the Krebs cycle, what substance is released? ______________________
4. How are electrons stored during the Krebs Cycle?
5. What is the purpose of the Electron Transport Chain (ETC)?
6. Why does aerobic respiration need oxygen? What happens if oxygen is not present?
7. What gas is released during the ETC? Why?
8. What stores more energy – ATP or glucose? ____________________________
9. When would a human use aerobic respiration? When would a human use anaerobic respiration? Why?
10. List 4 differences and 4 similarities between aerobic cellular respiration and photosynthesis.
Mrs. Rippin Page 3 of 3 9/19/13