Photosynthesis Flashcards
Photosystem II
Photosystem II: How many photons are required per electron transferred?
1
Photosystem II: How many electrons are required to make O2?
4
Photosystem II: How many protons are pumped into the lumen per O2 molecule made?
4
What are the intermediates transferring electrons from photosystem II and cytochrome b6f?
Plastocyanin and plastoquinone
What is the main product of Photosystem II?
ATP
Cytochrome b6f
is an enzyme found in the thylakoid membrane in chloroplasts that catalyzes the transfer of electrons from plastoquinol to plastocyanin
Cytochrome b6f: How many protons are pumped into the lumen per O2 molecule made?
8
Cytochrome b6f: What is the Q cycle?
Cycle by which 2 electrons are taken from PQ and transferred one at a time to plastocyanin
Cytochrome b6f: To what soluble molecule are electrons passed?
Plastocyanin
Photosystem I
Photosystem I: How many photons are required to elevate one electron?
1
Photosystem I: How many protons are pumped into the lumen?
0
photosystem I: To what soluble molecule are electrons passed?
Ferredoxin
What is the main product of photosystem I?
NADPH
Cyclic photophsophorylation
the synthesis of ATP coupled to electron transport activated by Photosystem I solely
When does cyclic photophosphorylation occur?
When NADP+ is depleted
What is the main product of cyclic photophosphorylation?
ATP
Cyclic PPP: How many protons are pumped for each electron transferred?
2
Calvin cycle
The dark reactions of photosynthesis are a series of chemical reactions that convert carbon dioxide, use the chemical energy of ATP, and reduce NADPH’s power from the light-dependent reactions into glucose.
How many turns of the Calvin cycle are required to regenerate starting ribulose 5’ phosphate?
3
Calvin cycle: The fixing of 1 carbon of CO2 requires how many NADPH?
2
Calvin cycle: The fixing of 1 carbon of CO2 requires how many ATP?
3
Transaldolase
Transketolase
