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Practice: Photophosphorylation 1 quiz

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  • What is the ultimate electron acceptor in photosynthetic light reactions in plants?
    The ultimate electron acceptor is NADP+, which gets reduced to NADPH.
  • Does cyclic electron flow produce oxygen or NADPH?
    No, cyclic electron flow produces ATP but does not produce oxygen or NADPH.
  • Which photosystem is involved in cyclic electron flow?
    Cyclic electron flow involves only photosystem 1.
  • What is the role of ferredoxin in cyclic electron flow?
    Ferredoxin returns electrons to the proton pump instead of producing NADPH.
  • Why is no oxygen produced during cyclic electron flow?
    No oxygen is produced because water is not split, as photosystem 2 is not involved.
  • Where are rhodopsins found besides archaea?
    Rhodopsins are also found in human eyes and can function as chloride pumps.
  • What is the main function of chlorophyll molecules in a photosystem?
    They transfer excitation energy to the reaction center chlorophyll.
  • How does the light-harvesting complex in chloroplasts function?
    It acts like an antenna, focusing excitation energy to the reaction center.
  • What equation is used to calculate the energy of a photon?
    The Planck-Einstein equation is used, involving Planck's constant, the speed of light, and the wavelength.
  • What units must be carefully converted when using the Planck-Einstein equation?
    Wavelength units, such as nanometers to meters, must be converted properly.
  • What is the energy of a single photon calculated in the example?
    It is 2.925 x 10^-19 joules per photon.
  • How do you calculate the energy for a mole of photons?
    Multiply the energy of one photon by Avogadro's number.
  • What is Avogadro's number?
    Avogadro's number is 6.022 x 10^23.
  • What is the approximate energy for a mole of photons as calculated in the lesson?
    It is approximately 176 kilojoules per mole.
  • Which photosystem is responsible for splitting water and releasing oxygen?
    Photosystem 2 is responsible for splitting water and releasing oxygen.