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Home Biochemistry Photosynthesis and Respiration Comments

  • Question
  • If the oxygen is labeled in CO2 and provide this CO2 to a plant, where it is expected to find this labeled oxygen after the plant had undergone photosynthesis?


  • Options
  • A. In the water used
  • B. In the NADPH
  • C. In the carbohydrate produced
  • D. In the oxygen given off by the plant

  • Correct Answer
  • In the carbohydrate produced 


  • Photosynthesis and Respiration problems


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    • 1. In algae, photosynthesis takes place in

    • Options
    • A. choloroplasts
    • B. cell membrane
    • C. mitochondria
    • D. none of the above
    • Discuss
    • 2. What do coenzyme A, CO2, oxaloacetate, and FADH2 all have in common?

    • Options
    • A. They are all components or products of the citric acid cycle
    • B. They are part of the dark reactions of photosynthesis
    • C. They are part of the reactions of lactic acid fermentation
    • D. They are all elements of oxidative phosphorylation
    • Discuss
    • 3. The cytochrome c oxidase complex

    • Options
    • A. accepts electrons from cyt c
    • B. donates four electrons to O2
    • C. pumps protons out of the matrix space
    • D. all of these
    • Discuss
    • 4. In oxygenic photosynthesis, the electron donor is

    • Options
    • A. water
    • B. oxygen
    • C. NADH
    • D. NADPH
    • Discuss
    • 5. What do NAD+, NADP+, and FAD+ all have in common?

    • Options
    • A. They are reduced
    • B. They have a full complement of electrons
    • C. They are oxidized
    • D. They are what is used during carbon fixation in photosynthesis
    • Discuss
    • 6. The followings are the products of the light reactions of photosynthesis except

    • Options
    • A. ATP
    • B. oxygen
    • C. NADPH
    • D. glucose
    • Discuss
    • 7. As a result of the photosynthetic process, which product is formed?

    • Options
    • A. Oxygen
    • B. Water
    • C. Carbon dioxide
    • D. Both (a) and (b)
    • Discuss
    • 8. Which of the following is the reduced form of a temporary electron carrier molecule?

    • Options
    • A. FADH2
    • B. ATP
    • C. NADP+
    • D. CO2
    • Discuss
    • 9. The electrons that are released by the splitting of water during photosynthesis ultimately end up in

    • Options
    • A. ATP
    • B. O2
    • C. NADPH
    • D. rubisco
    • Discuss
    • 10. Carbon fixation requires the expenditure of ATP molecules which is generated by

    • Options
    • A. formation of glucose during the Calvin cycle
    • B. replenishment of chlorophyll
    • C. ETS (electron transfer system) during the light reactions
    • D. none of the above
    • Discuss


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