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  • Question
  • Which of the following experimental results does not support Mitchell's chemiosmosis theory?


  • Options
  • A. Electron transport in isolated mitochondria was shown to result in acidification of the medium
  • B. Addition of dinitrophenol to isolated mitochondria was shown to inhibit electron transport, but had no effect on ATP synthesis
  • C. Addition of dinitrophenol to isolated mitochondria during electron transport was shown to inhibit acidification of the medium
  • D. An artificial proton gradient across the inner mitochondrial membrane drives ATP synthesis in the absence of electron transport

  • Correct Answer
  • Addition of dinitrophenol to isolated mitochondria was shown to inhibit electron transport, but had no effect on ATP synthesis 


  • Plant Structure problems


    Search Results


    • 1. Cellular metabolism is an example of

    • Options
    • A. equilibrium metabolism
    • B. steady-state metabolism
    • C. a series of reactions occurring under standard conditions
    • D. a series of reactions that defy the second law of thermodynamics
    • Discuss
    • 2. In plant cells, which of the following is not a function of the large central vacuoles of plant cells?

    • Options
    • A. Storage of food
    • B. Support
    • C. Contractile regulation of
    • D. Waste storage water content
    • Discuss
    • 3. Which of the following elements is likely to form the least polar covalent bond with hydrogen?

    • Options
    • A. Nitrogen
    • B. Oxygen
    • C. Carbon
    • D. Phosphorus
    • Discuss
    • 4. If the ester bonds of a triacylglycerol molecule's are broken then the kind of molecule, which would be soluble in water, is

    • Options
    • A. fatty acid
    • B. steroid
    • C. glycogen
    • D. glycerol
    • Discuss
    • 5. Which molecule serves as a carrier of fatty acids in mitochondria?

    • Options
    • A. Acetyl-CoA
    • B. Carnitine
    • C. Dolichol
    • D. Malonyl-CoA
    • Discuss
    • 6. Normally CO2 and O2 enter a plant by

    • Options
    • A. osmosis
    • B. active transport
    • C. diffusion
    • D. evaporation
    • Discuss
    • 7. A widely accepted explanation for transport of sugar in phloem is called

    • Options
    • A. root pressure theory
    • B. transpiration
    • C. pressure flow hypothesis
    • D. cytoplasmic streaming
    • Discuss
    • 8. The movement of most minerals, including potassium into root cells is by

    • Options
    • A. osmosis
    • B. diffusion
    • C. bulk flow
    • D. active transport
    • Discuss
    • 9. Water moves into roots of plants by

    • Options
    • A. osmosis
    • B. active transport
    • C. diffusion
    • D. pressure flow mechanism
    • Discuss
    • 10. When guard cells swell

    • Options
    • A. stomata close
    • B. stomata open
    • C. photosynthesis stops
    • D. evaporation stops
    • Discuss


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