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Home Biochemistry Photosynthesis and Respiration Comments

  • Question
  • Electron transport systems play a vital role in


  • Options
  • A. Calvin cycle
  • B. photorespiration
  • C. light-dependent reactions
  • D. all of these

  • Correct Answer
  • light-dependent reactions 


  • Photosynthesis and Respiration problems


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    • 1. Where does the O2 come from that is essential for the proper functioning of oxidative phosphorylation?

    • Options
    • A. Fermentation
    • B. Light reactions of photosynthesis
    • C. Dark reactions of photosynthesis
    • D. Carbon fixation
    • Discuss
    • 2. Oxidative phosphorylation is to respiration as __________ is to photosynthesis

    • Options
    • A. carbon fixation
    • B. electron transport chain
    • C. light capture by chlorophyll
    • D. reduction of NADPH
    • Discuss
    • 3. The vast majority of the molecules that act as energy carriers to power cellular activities are made in

    • Options
    • A. the nucleus
    • B. the Golgi apparatus
    • C. the cytosol
    • D. the mitochondria and chloroplasts
    • Discuss
    • 4. Which enzyme is involved in carbon-fixation reaction?

    • Options
    • A. NADP reductase
    • B. Cytochrome reductase
    • C. Ribulose bisphosphate carboxylase
    • D. Glycerol kinase
    • Discuss
    • 5. In the Calvin cycle, carbon dioxide is fixed in a reaction with the

    • Options
    • A. ribulose diphosphate
    • B. ribulose phosphate
    • C. ribose tri phosphate
    • D. 3-phosphoglyceric acid
    • Discuss
    • 6. Which of the following represents a correct ordering of the events that occur during the respiration of glucose in the absence of O2?

    • Options
    • A. Glycolysis; citric acid cycle; oxidative phosphorylation
    • B. Glycolysis; oxidative phosphorylation; citric acid cycle
    • C. Oxidative phosphorylation; citric acid cycle; glycolysis
    • D. Glycolysis; fermentation
    • Discuss
    • 7. Which of the following structures or processes are logically associated with chloroplasts?

    • Options
    • A. Plant cells
    • B. Chlorophyll
    • C. Thylakoid membranes
    • D. All of these
    • Discuss
    • 8. Assume the combined processes of photosynthesis and cellular respiration, the electrons that start as part of H2O at the beginning of the light reactions end up attaching to

    • Options
    • A. O2 to make new H2O
    • B. NADPH to make new glucose
    • C. pyruvate to make ethanol
    • D. electron transport carriers to make O2
    • Discuss
    • 9. Glycolysis takes places in the __________ and produces __________ , which in the presence of oxygen then enters the __________ .

    • Options
    • A. cytosol; glucose; mitochondrion to complete fermentation
    • B. cytosol; pyruvate; mitochondrion to complete fermentation
    • C. cytosol; pyruvate; mitochondrion to complete cellular respiration
    • D. mitochondrion; pyruvate; chloroplast to complete photosynthesis
    • Discuss
    • 10. Which one of the following is a product of both cyclic and noncyclic photophosphorylation?

    • Options
    • A. NADPH
    • B. O2
    • C. ATP
    • D. Carbohydrate
    • Discuss


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