In cyclic photophosphorylation in photosystem I, ATP is produced, even though water is not split. Explain how the process takes place.
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Q: Which photosystem is involved in cyclic photophosphorylation?
A: Photosystem 1 is involved in cyclic photophosphorylation reaction.
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Q: Which of the following is CORRECT regarding cyclic photophosphorylation?
A: The correct option regarding cyclic photophosphorylation is - OCCURS WITH PHOTOLYSIS OF WATER.
Q: Name the structure where photophosphorylation takes place.
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In cyclic photophosphorylation in photosystem I, ATP is
produced, even though water is not split. Explain how the process
takes place.
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- The Overall Free Energy Change for Photosynthetic NADP+ Reduction What is the overall free energy change (G) for noncyclic photosynthetic electron transport? 4 (700-nm photons) + 4 (680-nm photons) + 2 H2O + 2 NADP+O2 + 2 NADPH + 2H+The Relative Efficiency of ATP Synthesis in Noncyclic versus Cyclic Photophosphorylation If noncyclic photosynthetic electron transport leads to the translocation of 7 H+/2e- and cyclic photosynthetic electron transport leads to the translocation of 2 H+/e-, what is the relative photosynthetic efficiency of ATP synthesis (expressed as the number of photons absorbed per ATP synthesized) for noncyclic versus cyclic photophosphorylation? (Assume that the CF1CF0-ATP synthase yields 3 ATP/14 H+.)What is photophosphorylation by oxidative phosphorylation? Explain by comparison.
- n cyclic photophosphorylation in photosystem I, ATP is produced, even though water is not split. Explain how the process takes placeIn photosynthetic organisms that have two photosystems, a key reason to increase non-cyclic electron flow through photosystem complexes is to:In cyclic photophosphorylation, it is estimated that two electrons must bepassed through the cycle to pump enough protons to generate one ATP.Assuming that the ∆G for hydrolysis of ATP under conditions existing inthe chloroplast is about -50 kJ/mol, what is the corresponding percent efficiency of cyclic photophosphorylation, using light of 700 nm?
- Condition: A transmembrane (or integral membrane) protein that acts as a H+ channel has been added to the thylakoid membrane. What impact will thishave to photosynthesis? Explain why. (Specific values are not required, just an indication of overall effect and reasons why.)In the Light Reaction of Photosynthesis, the sun excites electrons in pigment molecules in the photosystems. These excited electrons and (H+ ions) go through electron transport systems. Keep in mind that if this process continued as stated, the pigment molecules would run out of electrons, but fortunately there is a way in which the excited electrons are replaced. Explain how the electrons are ultimately replaced and what the important byproduct is.Assume a thylakoid is somehow punctured so that the interior of the thylakoid is no longer separated from the stroma but the photosystems and membrane proteins of the electron transport chain are unharmed. This damage will have the most direct effect on which of the following processes?
- Describe the flow of electrons through photosystems I and II in the noncyclic electron transport pathway and the products produced. Contrast this flow with cyclic electron transport.Explain, using a simple diagram, the relationship between acyclic photophosphorylation (photophase) and the Calvin cycle (dark phase).In cyclic photophosphorylation, it is estimated that two electrons must be passed through the cycle to pump enough protons to gener- ate one ATP. Assuming that the AG for hydrolysis of ATP under con- ditions existing in the chloroplast is about –50 kJ/mol, what is the corresponding percent efficiency of cyclic photophosphorylation, using light of 700 nm?
