How does this work? It might have been assumed that the electrontransport chain serves the production of energy-rich intermediatesand that these constitute an energy store for the production ofATP. Two arguments against this idea exist:
1. Which of the following represents a correct sequence during photosynthesis? A) Photosystem I - ATP production - Photosystem II - NADPH production. B) Photosystem I - NADPH production - Photosystem II - ATP production.
Photosynthetic Electron Transport Flashcards | Quizlet
How are the photosystems organized?
How are the pigments arranged?
Why does one of the chlorophyll molecules react differentthan all the others?
Why are action and absorption spectra not quite congruent?
Why reacts P 680 (chlorophyll a) different than P 700 (chlorophylla, too)?
How are electron transport chain and ATP production coupled?
How are photosystem I and II linked?
Which structural prerequisites have to exist in order forthe two systems to co-operate?
Photosynthesis / 1 Photosynthetic electron transport …
This sketch follows the lead of Karp to place the events relative to the membrane. This makes it clearer that the process of producing the ATP is driven by the proton gradient. Karp points out that this cyclic photophosphorylation also takes place in isolated chloroplasts and can provide additional ATP to aid the carbohydrate synthesis taking place as result of the .
Photosynthesis / 1 Photosynthetic electron transport and ..
Together, these factors should allow sufficient ΔGATP to maintain lumen pH in a range where lumenal enzyme activities are nearly optimal, and where the level of NPQ is regulated.AB - The photosynthetic electron transfer chain generates proton motive force (pmf), composed of both electric field (Δψ) and concentration (ΔpH) gradients.