Photosynthesis Warm Up 2

10 Questions | Total Attempts: 181

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Photosynthesis Warm Up 2

Welcome to the electronic frontier classroom of the 21st Century. This warm up exercise will concentrate on the Calvin Cycle, carbon fixation, and alternative pathways. You will find additional information on the science web site, Mitchell's Cosmic Adventure. This warm up permits you an unlimited number of attempts to improve learning and test-taking skills. As a bonus, each attempt randomly generates new questions and answers.


Questions and Answers
  • 1. 
    The carbon fixation cycle can and do occur under which conditions?
    • A. 

      Light only

    • B. 

      Without light only

    • C. 

      Light only in C4 plants

    • D. 

      Light and without light

    • E. 

      Without light in C4 plants

  • 2. 
    In step 1 of the Calvin Cycle, Carbon dioxide diffuses into the stroma from the surrounding_____.
    • A. 

      Cytosol

    • B. 

      Ribosomes

    • C. 

      Nucleus

    • D. 

      Lysosomes

    • E. 

      Golgi Apparatus

  • 3. 
    In step 2 of the Calvin Cycle, each molecule of 3-PGA is converted into another three-carbon molecule called_____.
    • A. 

      Ribulose bisphosphate

    • B. 

      3-Phosphoglycerate

    • C. 

      Glyceraldehyde 3-phosphate

    • D. 

      6-Phosphoglycerate

    • E. 

      Adenosine Triphosphate

  • 4. 
    In step 3 of the Calvin Cycle, one of the G3P molecules leaves the Calvin Cycle and is  used to make which organic molecules.
    • A. 

      Lipids

    • B. 

      3-Phosphoglycerate

    • C. 

      Fatty Acids

    • D. 

      6-Phosphoglycerate

    • E. 

      Carbohydrates

  • 5. 
    In step 4 of the Calvin Cycle, the remaining _____ molecules are converted back into _____ through the addition of phosphate groups from ATP molecules.
    • A. 

      3-PGA : ADP

    • B. 

      3-PGA : RuBP

    • C. 

      G3P : RuBP

    • D. 

      DNA : RNA

    • E. 

      3-PGA : ATP

  • 6. 
    Research has shown when a plant's stomata are partly closed, the level of _____ in the plant falls as Carbon Dioxide is consumed in the Calvin Cycle.
    • A. 

      Water

    • B. 

      Carbon Dioxide

    • C. 

      Ribulose Bisphosphate

    • D. 

      Glyceraldehyde 3-phosphate

    • E. 

      3-Phosphoglycerate

  • 7. 
    Which statement below inhibits carbon fixation by the Calvin cycle?
    • A. 

      Low Carbon Dioxide level : Low Oxygen level

    • B. 

      Low Carbon Dioxide level : High Water level

    • C. 

      High Carbon Dioxide level : Low Water level

    • D. 

      Low Carbon Dioxide level : High Oxygen level

    • E. 

      High Oyxgen level : High Water level

  • 8. 
    The Crassulacean Acid Metabolism (CAM) is a water conserving pathway for such plants like the Jade plant. Stomata are opened during the day and closed at night.
    • A. 

      True

    • B. 

      False

  • 9. 
    Please check those plants which adapt to hot, dry climates using the CAM pathway. (Please note there are 2 correct answers for this question.)
    • A. 

      Corn

    • B. 

      Sugar Cane

    • C. 

      Timothy grass

    • D. 

      Crab Grass

    • E. 

      Cactuses

    • F. 

      Pineapples

  • 10. 
    Plants that use the CAM pathway open their stomata at night and close them during the day, just opposite of the C3 plants. Choose the most correct statment concerning CAM plants.
    • A. 

      CAM plants take in Carbon Dioxide during the day

    • B. 

      CAM plants take in Carbon Dioxide during the night

    • C. 

      CAM plants take in Oxygen during the day

    • D. 

      CAM plants take in Oxygen during the night

    • E. 

      CAM plants take in water only during the night