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Photosynthesis

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QuestionAnswer
What is the first step in photosynthsis? Light hits photosystem 2
After light hits photosystem 2, what happens? Electrons are stripped from the chlorophyll and go to the photosystem 1 via the ETC (Electron Transport Chambers)
What happens the same time the electrons start to enter the ETC? Water splits to replace the missing electrons (photolysis)
What is also taken from the water during photolysis? An oxygen atom (released from the cell as 02, oxygen gas), and 2 H+ hydrogen ions that remain in the thylakoid
What happens to the electrons while traveling? They pass down the ETC, losing energy with each 'bounce', from protein to protein
What happens to the lost energy? The energy is used to pump hydrogen ions (H+) into the inner thylakoid space
What happens to the electrons after the ETC? They enter the photosystem 1, and get reenergized, restarting the process again
What happens after Photosystem 1? The electrons get passed to the final electron accepter, NADP+, which turns into NADPH, an energy carrier
What is the chemical reaction for NADP+ (NADP+)+(2e-)+(2H+)=NADPH
What happens to the waiting H+ hydrogen ions? They have a high concentration inside the thylakoid, so they diffuse outward through a membrane protein called ATP synthase
What happens when the H+ Hydrogen ions diffuse outwards? The outflow releases energy to produce ATP from ADP and P
Created by: vrapolu
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