In the photosynthetic antenna, the a. photon-excited electrons are passed from one pigment molecule to another b. the excited photon is transferred directly to the reaction center c. the energy absorbed is passed to electrons associated with the neighboring pigment via energy resonance transfer d. the energy is used to emit an electron via energy resonance transfer
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When a photon excites an electron into a higher energy orbital, that electron can either transfer the energy to an adjacent pigment molecule or dissipate the energy in the form of light and heat.
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Suppose that neighboring antenna molecules are separated by about $10^{-10} \mathrm{m}$ and that the excitation energy is transferred 100 times between neighboring antenna molecules before the photoelectric transfer of an electron to the electron transport chain. Which answer below is closest to the minimum speed of the excitation energy through the photosynthetic unit? $$\begin{array}{llll}{\text { (a) } 1 \mathrm{m} / \mathrm{s}} & {\text { (b) } 10^{2} \mathrm{m} / \mathrm{s}} & {\text { (c) } 10^{4} \mathrm{m} / \mathrm{s}}\end{array}$$ $$(d) 10^{-2} \mathrm{m} / \mathrm{s} \quad (e) 10^{-4} \mathrm{m} / \mathrm{s}$$
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