Photosynthesis II

Question 1

electron and proton movements in photosynthesis

Answer 1

These occur in photosystem II and photosystem I

Question 2

How do electrons and protons move in photosystem II

Answer 2

PSII electron transport chain (ETC) similar to respiration ETC (cytochromes)

Question 3

How do electrons and protons move in photosystem I

Answer 3

PSI ETC (Fe-S proteins) different than PSII/aerobic ETC 
no H+ pumped

Question 4

How exactly do electrons and protons move in photosystem II

Answer 4

• e- flow down ETC generates proton gradient
• Proton gradient (PMF) used to produce ATP
• Water oxidized to O2

Question 5

How exactly do electrons and protons move in photosystem I

Answer 5

e- flow down ETC delivers electrons to NADP+, producing NADPH

Question 6

Noncyclic photophosphorylation; Z-scheme

Answer 6

Chloroplasts and cyanobacteria have 2 photosystems

Question 7

2 types of photophosphorylation

Answer 7

noncyclic

cyclic

Question 8

What is the difference between cyclic and noncyclic photophosphorylation

Answer 8

cyclic- PSII only produces ATP, electrons return

noncyclic- PSII produces ATP & NADPH, electrons do not return

Question 9

what is photophosphorylation

Answer 9

production of ATP in the chloroplast

Question 10

If PSI of cyclic is producing ATP

Answer 10

it is not producing NADPH

Question 11

Z scheme for photosynthesis

Answer 11

shows flow of electrons from water to NADPH

Question 12

Single photon of visible light does not have enough energy to withdraw e- from water and force them to NADP+

Answer 12

True

It needs the z scheme to do this by bridging the gap of energy

Question 13

Water is a poor

Answer 13

electron donor

Question 14

NADP+ is poor

Answer 14

electron acceptor