Light Dependent Rxns Flashcards
Where does the first process in Light Dependent rxns start?
Photosystem II
Process 1: Photosystem II
In photosystem II which chlorophyll is activated?
p680
Process 1: Photosystem II
What is removed from the activated p680 molecule?
An electron pair
Process 1: Photosystem II
Where are electrons removed from after p680 molecule?
H2O
Process 1: Photosystem II
What is the ultimate goal?
Start setting up an H+ (proton) gradient
Process 2: Electron Transport System
What receives electrons from p680
Plastoquinone (PQ)
embedded in the thylakoid membrane
Process 2: Electron Transport System
Electrons leave PQ and are handed of into/through a chain of ___ and gradually lose energy
Proteins
Electron Transport System
The lost electron energy is used for active transport to pump H+ from ___ to ___
Stroma to thylakoid space
Process 2: Electron Transport System
2 Goals
- Move H+ from the stroma into thylakoid space
2. Transfer electrons to plastocyanin to transfer to p700 chlorophyll
Process 3: Photosystem I
Excited ___ molecule loses electron pair
p700
Process 3: Photosystem I
Electrons are replaced by ___ in p700
Plastocyanin
Process 3: Photosystem I
Initial p700 pair reduce NADP to ___
NADPH
Process 3: Photosystem I
Goal
Increase gradient as H+ is bound to NADP in stroma
Process 4: Chemiosmosis
Use ATP synthase to convert kinetic energy of H+ flowing down the gradient into potential energy as 3rd phosphate bond on ADP to transform it into ___
ATP
Process 4: Chemiosmosis
Goal
Store energy in ATP
