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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.
Where are PSI and PSII located?
Photosystem I (PSI) and Photosystem II (PSII) are located in the thylakoid membranes of chloroplasts in plant cells. PSII is situated at the beginning of the photosynthetic electron transport chain, while PSI is located further along the chain. Both systems play crucial roles in the light-dependent reactions of photosynthesis, facilitating the conversion of light energy into chemical energy.
What is the source of electronic that fill the deficit in photosystem 2?
The source of electrons that fills the deficit in Photosystem II (PSII) is water (H₂O). During the light-dependent reactions of photosynthesis, water molecules are split through a process called photolysis, releasing oxygen, protons, and electrons. These electrons are then transferred to PSII, replenishing the electron deficit created when PSII absorbs light energy and excites its electrons.
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.
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.
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.
Where are PSI and PSII located?
Photosystem I (PSI) and Photosystem II (PSII) are located in the thylakoid membranes of chloroplasts in plant cells. PSII is situated at the beginning of the photosynthetic electron transport chain, while PSI is located further along the chain. Both systems play crucial roles in the light-dependent reactions of photosynthesis, facilitating the conversion of light energy into chemical energy.
What is the source of electronic that fill the deficit in photosystem 2?
The source of electrons that fills the deficit in Photosystem II (PSII) is water (H₂O). During the light-dependent reactions of photosynthesis, water molecules are split through a process called photolysis, releasing oxygen, protons, and electrons. These electrons are then transferred to PSII, replenishing the electron deficit created when PSII absorbs light energy and excites its electrons.
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.
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.
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 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
Where does photo-system 2 get its replacement electrons from?
Photosystem II (PSII) obtains its replacement electrons from water molecules during the process of photolysis. When water is split into oxygen, protons, and electrons, the electrons released are used to replenish those lost by PSII after it absorbs light energy. This process also generates oxygen as a byproduct, which is released into the atmosphere.
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.
