pathway of photosynthesis

Question 1

what happens in photosystem 2 p680

Answer 1

• Oxidizes water into electrons, protons, and oxygen gas (released for us!)
• Photon of light excites P680*, releasing an electron to primary acceptor and creating P680+
• P680 is highly electronegative (*) and water is oxidized leaving H+ and oxygen gas

Question 2

how many times dose photosystem 2 p680 happen per each molecule

Answer 2

2 times per water molecule

Question 3

what happens after PQ (protein) receives an electron from the primary acceptor

Answer 3

it moves the electron to the moves to “cytochrome complex” and, Energy carried in electron moves another H+ into the thylakoid

Question 4

what happens from the cytochrome complex

Answer 4

energy is nearly gone and electron is shuttled through PC carrier to PSI

Question 5

what happens in chlorophyll 1 P700

Answer 5

• A second photon is used to provide more energy
• This high energy electron is transferred along the chain and used to reduce NADP+ to NADPH (similar to NADH in cell. Respiration)

Question 6

what does photosystem 2 do in photosystem 1

Answer 6

Photosystem I, cytochrome complex (PQ), Photosystem II create a proton gradient across the thylakoid membrane

Question 7

how is this gradient made

Answer 7

1. Oxidation of water
2. Carrying protons across with PQ
3. Removal of protons from the stroma during reduction NADP+

Leads to ATP synthesis through ATP synthase!! Chemical energy from Light energy!!!