(Photoexcitation/Photoactivation) Step 1 of Light dependant reactions
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What is a photosystem and what is it made of
Chlorophyll molecules, accessory pigments and proteins in thylakoid skin/membrane. Antenna system = Cholorphyll molecules and accessory pigments Reaction centre = protein complex with chlorophyll a at center
Name the two photosystems in chloroplasts
PS1(P700) and PS2(P680)
how do photosystems function
antenna pigments absorb a photon and transfer the energy to the reaction center (chlorophyll a molecule) an electron from chlorophyll a absorbs the transferred energy (ground state to excited state) this excited electron is then transferred (through redox reactions) to a primary electron acceptor. more electrons come from the splitting of water (photolysis) by Z protein at the base of PSll (replacing those lost to electron acceptors) when H 2 O is split to provide electrons, free H + build up inside the thylakoids (high [ ])