Pathways of Photosynthesis (Unit 2) Flashcards
What are photosystem II and I and what do they do?
Two light capturing complexes used by photoautotrophs. Electron carriers of the systms use non-protein organic groups that become oxidized and reduced as electrons move through. Carriers similar to mitochondrial to ETC
What happens in photosystem II?
Splitting of water into electrons, protons and oxygen gas
How does photosystem II slip water?
Light photo hits into an antenna complex, getting absorbed and then transferred to molecule P680. This excites an electron making it P680. The electron is transferred to a primary acceptor molecule becoming positively charged again
What can the positively charged P680+ do?
Extremely electronegative, and can remove an electron from a molecule of water
How is the reduction of P690+ reduction to P680 facilitated?
Enzyme subunit of photosystem II = watersplitting complex occur into the thylakoid membrane that faces the lumen
What is involved in the first steps of the ETC in the thylakoid membrane?
Transfer of high energy electron to primary acceptor, then to plastoquione (PQ)
What happens in the transfer of electrons with PQ
Light energy is transferred to electrons generates a proton gradient
What happens at the end of the ETC?
Second photosystem energizes the electron for the second time
How