Cell Bio - Chapter 7 (Photosynthesis)

43 Questions | Total Attempts: 100

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Cell Bio - Chapter 7 (Photosynthesis)

Questions and Answers
  • 1. 
    Describe the overall process of photosynthesis.
  • 2. 
    Compare the carbon input and output of the Calvin cycle. 
  • 3. 
    Examine how ATP and NADPH are produced from redox reactions and membrane gradients. 
  • 4. 
    Examine the significance of RuBP carboxylase enzyme to photosynthesis.
  • 5. 
    Compare and contrast C3, C4, and CAM plants. 
  • 6. 
    ____ is a product of the Calvin Cycle that is used to form glucose phosphate, amino acids or fatty acids. 
    • A. 

      ATP

    • B. 

      Ribulose biphosphate (RuBP)

    • C. 

      Glyceradehyde-3-phosphate (G3P)

    • D. 

      PEP carboxylase (PEPcase)

    • E. 

      Carbon dioxide

  • 7. 
    The action spectrum of photosynthesis shows a high light absorption for violet/blue and orange/red and a low absorption for green/yellow. If we were to set up an experiment where narrow bands of unicolored light were shown on an aquatic plant such as Elodea, and we counted the number of bubbles of oxygen produced as an indicator of photosynthetic rate, how would the graph appear?
    • A. 

      Just like the action spectrum with peaks at violet/blue and orange/red and a trough at yellow/green

    • B. 

      Exactly inverted from the action spectrum with a peak for yellow/green

    • C. 

      Perfectly flat because many wavelengths are used by chlorophyll

    • D. 

      A descending line because ultra-violet has more energy than infra-red

    • E. 

      There is no way to guess without actually running the experiment

  • 8. 
    C-4 plants:
    • A. 

      Store carbon dioxide temporarily as oxaloacetate

    • B. 

      Are found in hot, dry climates

    • C. 

      Have a net photosynthetic rate two to three times that of C-3 plants

    • D. 

      All of the choices are correct

  • 9. 
    Chemiosmotic ATP synthesis occurs in the cytosol of the cell.
    • A. 

      True

    • B. 

      False

  • 10. 
    An early experiment by Van Helmont (1600s) describes how he "grew a tree in a large pot and found that after five years, the amount of soil in the pot had not changed. He concluded that the increase in weight was due to the addition of water." At that time, the compounds in the air had not yet been identified. Today, you know that he only discovered half the store. Which additional experiment would provide evidence for the rest of the story?
    • A. 

      A very careful audit of the water taken in and lost by the tree would have revealed only half the added weight gained by the tree.

    • B. 

      Carbon is discovered as a major element in trees and is lacking in water molecules.

    • C. 

      Radioactive carbon in CO2 in the air is soon located as part of tree structures.

    • D. 

      The critical experiment involves the conversation of nutrients in the soil.

    • E. 

      All but the nutrient conversion is correct.

  • 11. 
    The first event in the Calvin cycle is the attachment of carbon dioxide to the five-carbon RuBP molecule, which: decreases cell carbon dioxide levels, which increases the diffusion gradient. 
    • A. 

      True

    • B. 

      False

  • 12. 
    The first event in the Calvin cycle is the attachment of carbon dioxide to the five-carbon RuBP molecule which: forms a six-carbon molecule that immediately breaks down into three-carbon PGA molecules.
    • A. 

      True

    • B. 

      False

  • 13. 
    The first event in the Calvin cycle is the attachment of carbon dioxide to the five-carbon RuBP molecule which: immediately becomes a six-carbon sugar that is the base for starch, sucrose, cellulose, etc. 
    • A. 

      True

    • B. 

      False

  • 14. 
    The first event in the Calvin cycle is the attachment of carbon dioxide to the five-carbon RuBP molecule which: is a reaction assisted by large quantities of RuBP carboxylase enzyme. 
    • A. 

      True

    • B. 

      False

  • 15. 
    Fossil fuels are full of energy stored from photosynthesis millions of years ago. 
    • A. 

      True

    • B. 

      False

  • 16. 
    The function of sunlight in photosynthesis is to: 
    • A. 

      Reduce NADPH to NADP

    • B. 

      Fix O2 in the Calvin cycle

    • C. 

      Excite electrons in chlorophyll

    • D. 

      Combine carbon dioxide and water to form ATP and NADPH

  • 17. 
    G3P (glyceraldehyde 3 phosphate) is used by plants for all of the following EXCEPT the formation of
    • A. 

      Fatty acids

    • B. 

      Amino acids

    • C. 

      Oxygen

    • D. 

      Sucrose

  • 18. 
    Characterize the reactions involved in these reactions of the Calvin cycle. 
    • A. 

      These reactions involved in the regeneration of RuBP. The reactions include an exergonic reaction (ATP - ADP) and the reduction of the coenzyme NADPH.

    • B. 

      These reactions are involved in the reduction of CO2. Energy is required in the form of ATP, which is hydrolyzed to ADP. The substrate BPG is reduced, while the coenzyme NADPH is oxidized

    • C. 

      These reactions are involved in the fixation of CO2. Energy is required in the form of ADP, which is hydrolyzed to ATP. The substrate BPG is oxidized, while the coenzyme NADPH is reduced.

    • D. 

      These reactions are part of Light Reactions in noncyclic pathway. ATP and NADPH are used during these reactions.

  • 19. 
    If plants were only able to undergo the cyclic pathway, which of the following would NOT be true?
    • A. 

      Plants would not produce oxygen.

    • B. 

      Carbohydrates could still be produced but in much smaller quantities.

    • C. 

      More NADPH would be produced during the cyclic electron pathway.

    • D. 

      ATP production would decrease due to a smaller amount of H+ being available.

  • 20. 
    If the Calvin cycle uses three molecules of CO2 to produce six molecules of G3P (glyceraldehyde-3-phosphate), but only one G3P molecule is used to form a carbohydrate molecule, what happens to the other carbons that were taken in?
    • A. 

      Any unused CO2 is released into the environment.

    • B. 

      The other five G3P molecules are used to regenerate more RuBP.

    • C. 

      Any unused G3P molecule is converted and stored as starch.

    • D. 

      The remaining five G3P molecules are used to reduce CO2.

  • 21. 
    The light-dependent reactions of photosynthesis occur in the stroma of the chloroplast.
    • A. 

      True

    • B. 

      False

  • 22. 
    The major enzyme that 'fixes' carbon dioxide is called
    • A. 

      Ribulose biphosphate carboxylase(rubisco)

    • B. 

      Glyceraldehyde-3-phosphate (G3P)

    • C. 

      PEP carboxylase (PEPcase)

    • D. 

      Lactate dehydrogenase

  • 23. 
    Oxygen production in photosynthesis involves all of the following EXCEPT
    • A. 

      Photosystem one

    • B. 

      Photosystem two

    • C. 

      Splitting of water

    • D. 

      Light reactions

  • 24. 
    Phosphoenylpyruvate carboxylase (PEPcase) fixes carbon dioxide (C1) to PEP (C3) to form oxaloacetate (C4) within mesophyll cells of the C-4 plants. 
    • A. 

      True

    • B. 

      False

  • 25. 
    Photorespiration is the process by which light is used to release the stored energy in carbohydrate molecules to perform all work in plant cells. 
    • A. 

      True

    • B. 

      False

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