Pathways of Photosynthesis (Unit 2)

Question 1

What are photosystem II and I and what do they do?

Answer 1

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

Question 1

What happens in photosystem II?

Answer 1

Splitting of water into electrons, protons and oxygen gas

Question 2

How does photosystem II slip water?

Answer 2

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

Question 3

What can the positively charged P680+ do?

Answer 3

Extremely electronegative, and can remove an electron from a molecule of water

Question 4

How is the reduction of P690+ reduction to P680 facilitated?

Answer 4

Enzyme subunit of photosystem II = watersplitting complex occur into the thylakoid membrane that faces the lumen

Question 5

What is involved in the first steps of the ETC in the thylakoid membrane?

Answer 5

Transfer of high energy electron to primary acceptor, then to plastoquione (PQ)

Question 6

What happens in the transfer of electrons with PQ

Answer 6

Light energy is transferred to electrons generates a proton gradient

Question 7

What happens at the end of the ETC?

Answer 7

Second photosystem energizes the electron for the second time

Question 8

How