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Why photolysis of water takes place at PSII and not at PSI in thallakoid channel?
Photolysis of water occurs at Photosystem II (PSII) because it has a higher oxidation potential than Photosystem I (PSI). This higher potential allows PSII to extract electrons from water molecules during the light-dependent reactions of photosynthesis. Additionally, the location of the water-splitting complex is specific to PSII, where it is positioned near the oxygen-evolving complex that facilitates water splitting.
What are the clusters of photosystems?
The two clusters of photosystems in plants are Photosystem I (PSI) and Photosystem II (PSII). PSII functions first in the photosynthetic electron transport chain, followed by PSI, and they work together to absorb light energy and carry out the reactions of photosynthesis.
Which is a role of photosystem ll in the light reactions?
Photosystem II (PSII) plays a crucial role in the light reactions of photosynthesis by capturing light energy and using it to energize electrons. This process initiates the photolysis of water, splitting it into oxygen, protons, and electrons. The energized electrons from PSII are then transferred to the electron transport chain, ultimately contributing to the synthesis of ATP and NADPH, which are essential for the Calvin cycle. Additionally, PSII helps to replenish its lost electrons by extracting them from water molecules.
What is the photosystem that feeds the electron transport chain and reduces NADP?
The photosystem that feeds the electron transport chain and reduces NADP+ is Photosystem II (PSII). When light is absorbed by PSII, it excites electrons, which are then transferred through a series of proteins in the electron transport chain. This process ultimately leads to the reduction of NADP+ to NADPH, a crucial molecule used in the Calvin cycle for photosynthesis. Additionally, PSII plays a key role in splitting water molecules, releasing oxygen as a byproduct.
What special pigment do plant cells contain?
Chlorophyll in the chloroplasts and other accesory pigments (p680 in PSII and p700 in PSI)
Why photolysis of water takes place at PSII and not at PSI in thallakoid channel?
Photolysis of water occurs at Photosystem II (PSII) because it has a higher oxidation potential than Photosystem I (PSI). This higher potential allows PSII to extract electrons from water molecules during the light-dependent reactions of photosynthesis. Additionally, the location of the water-splitting complex is specific to PSII, where it is positioned near the oxygen-evolving complex that facilitates water splitting.
What is the difference between PSI and PSII?
PSI (Photosystem I) and PSII (Photosystem II) are two different protein complexes in the thylakoid membrane of chloroplasts involved in the light-dependent reactions of photosynthesis. PSII functions first in the electron transport chain by absorbing light energy to oxidize water and generate oxygen, while PSI receives electrons from PSII and drives the production of NADPH for the Calvin cycle.
Are the chlorophyll molecules in PSI and PSII the same?
No, the chlorophyll molecules in Photosystem I (PSI) and Photosystem II (PSII) are not the same. They differ in absorption spectra and redox properties, allowing them to play distinct roles in the light reactions of photosynthesis.
What are the clusters of photosystems?
The two clusters of photosystems in plants are Photosystem I (PSI) and Photosystem II (PSII). PSII functions first in the photosynthetic electron transport chain, followed by PSI, and they work together to absorb light energy and carry out the reactions of photosynthesis.
Which is a role of photosystem ll in the light reactions?
Photosystem II (PSII) plays a crucial role in the light reactions of photosynthesis by capturing light energy and using it to energize electrons. This process initiates the photolysis of water, splitting it into oxygen, protons, and electrons. The energized electrons from PSII are then transferred to the electron transport chain, ultimately contributing to the synthesis of ATP and NADPH, which are essential for the Calvin cycle. Additionally, PSII helps to replenish its lost electrons by extracting them from water molecules.
What is the photosystem that feeds the electron transport chain and reduces NADP?
The photosystem that feeds the electron transport chain and reduces NADP+ is Photosystem II (PSII). When light is absorbed by PSII, it excites electrons, which are then transferred through a series of proteins in the electron transport chain. This process ultimately leads to the reduction of NADP+ to NADPH, a crucial molecule used in the Calvin cycle for photosynthesis. Additionally, PSII plays a key role in splitting water molecules, releasing oxygen as a byproduct.
What special pigment do plant cells contain?
Chlorophyll in the chloroplasts and other accesory pigments (p680 in PSII and p700 in PSI)
How is H electrochemical gradient established and maintained in photosynthesis?
The formation of NADPH, the movement of electrons from PSII to PSI, & the splitting of water
What photosystems are embedded in the electron transport chain?
PSII, PSI, cytocromes, ferrodoxins are the part of ETC. They transport the protons to ATPase to produce ATP.
How are the chlorophyll molecules in PSI and PSII reset?
The chlorophyll molecules in Photosystem I (PSI) and Photosystem II (PSII) are reset when an electron is donated to them from an external source, such as when water is split during the light-dependent reactions of photosynthesis. This replenishes the electrons lost during the light-harvesting process, allowing the chlorophyll molecules to continue their role in capturing and transferring light energy.
When water molecules are split to produce the electrons needed to replace those lost by photo system 2 during photosynthesis what is produced?
Oxygen and H+ the overall equation is, 2H2O ----> O2 + 4H+ + 4electrons electrons as you know are taken up by PSII, H+ go on to form NADPH by combining with NADP+ at the end of PSI and O2 is a by product of photosynthesis
Write the equation connecting photo system 1 and photosystem 2?
The equation connecting Photosystem I (PSI) and Photosystem II (PSII) in photosynthesis is: 2H2O + 2NADP+ + 8 photons (light) → O2 + 2NADPH + 2H+ + 8 photons (light). This represents the light-dependent reactions in the thylakoid membrane where PSII and PSI work together to drive the production of energy carriers like ATP and NADPH.
