Chlorophyll a and accessory pigments serve only as

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Chlorophyll a and accessory pigments serve only as “antennae” that absorb energy  from the sun and pass it on At the center of antennae system there is a reaction center A pair of special chlorophyll a molecules and associated compounds that first receive  the solar energy from photosystem pigments and then transform this solar energy into  chemical energy Electrons from this pair are moved in a couple of ways one physical and one  metaphorical Physically these electrons are transferred to the primary electron acceptor Metaphorically these electrons move up the energy hill The energy from sunlight is pumping the electrons up the hill in photosynthesis Energy Transfer in Photosynthesis Works through Redox Reactions The movement of electrons within the reaction center from the chlorophyll a molecules  and the primary electron acceptor is a redox reaction Chlorophyll molecules were oxidized by the primary electron acceptor meaning they lost  electrons to it Electrons are passed on by the means of one electron carrier oxidizing another
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22:52 Stage 1: The Steps of the Light Reactions First step – is that solar energy is collected by photosystem II antennae molecules and  arrives at the reaction center This energy then gives boost to an electron in the reaction center in the two ways noted: The electron physically moves to another part of the reaction center complex, the  primary electron acceptor, and is also pumped up the energy hill With this activity, the reaction center chlorophyll has lost an electron the loss leaves an energy “hole” in this chlorophyll making it an oxidizing agent With the energy provided by this imbalance, a special enzyme in the reaction center  splits water molecules that lie within the thylakoid compartment
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