NEET Exam > NEET Questions > The electron ejected by P680 in light reactio...
Start Learning for Free
The electron ejected by P680 in light reaction is initially accepted by
- a)Plastoquinone
- b)ATP
- c)Ferredoxin
- d)P-700
Correct answer is option 'A'. Can you explain this answer?
| FREE This question is part of | Download PDF Attempt this Test |
Verified Answer
The electron ejected by P680 in light reaction is initially accepted b...
During the light reaction, the path of the electron has been elucidated in the Z-scheme. It is named so because of its shape and was first proposed by Hill and Bendall in 1960. The electron released by reaction center of photosystem II i.e., P680 moves uphill and reduces pheophytin, a nonmagnesium chlorophyll a molecule. From pheophytin, electrons are accepted by plastoquinone which requires two electrons for complete reduction. It also accepts two protons from the stromal side of thylakoid membrane and becomes reduced to PQH2 after accepting 2 electrons and 2 protons. It is the only carrier in the photosynthetic electron transport chain, which can bind both electrons and protons.
Most Upvoted Answer
The electron ejected by P680 in light reaction is initially accepted b...
The Electron Transport Chain in Photosynthesis
In the light reactions of photosynthesis, the electron transport chain plays a crucial role in the conversion of light energy into chemical energy. This process occurs in the thylakoid membrane of the chloroplasts and involves several protein complexes and electron carriers.
1. Photosystem II (PSII)
The electron transport chain starts with the absorption of light energy by the pigment molecule chlorophyll a in Photosystem II (PSII). This energy excites an electron in the chlorophyll molecule, which is then transferred to the primary electron acceptor, P680 (a specialized chlorophyll a molecule).
2. Electron Transfer to Plastoquinone (PQ)
Once the electron is transferred to P680, it becomes highly reactive and is immediately passed on to the electron carrier plastoquinone (PQ). Plastoquinone is a mobile carrier that shuttles electrons between different protein complexes in the thylakoid membrane.
3. Plastoquinone (PQ)
Plastoquinone accepts the high-energy electron from P680 and becomes reduced (PQH2). It then diffuses within the hydrophobic region of the thylakoid membrane to deliver the electron to the next protein complex in the electron transport chain.
4. Cytochrome b6f Complex
The reduced plastoquinone (PQH2) transfers its electron to the cytochrome b6f complex, another protein complex in the thylakoid membrane. This complex uses the electron to pump protons (H+) across the membrane, establishing a proton gradient.
5. Plastocyanin (PC)
The electron is then transferred from the cytochrome b6f complex to plastocyanin (PC), another mobile electron carrier. Plastocyanin shuttles the electron to Photosystem I (PSI), the next protein complex in the electron transport chain.
6. Photosystem I (PSI)
Photosystem I (PSI) absorbs light energy, similar to PSII, and transfers it to a specialized chlorophyll a molecule called P700. The excited electron in P700 is then transferred to another primary electron acceptor.
7. Ferredoxin (Fd)
The electron is passed from the primary electron acceptor of PSI to a small protein called ferredoxin (Fd). Ferredoxin accepts the electron and becomes reduced.
8. NADP+ Reductase
Finally, the reduced ferredoxin (Fd) transfers the electron to an enzyme called NADP+ reductase. This enzyme catalyzes the transfer of the electron to NADP+, along with a proton (H+), to form NADPH, a high-energy molecule that carries the electrons and protons to the Calvin cycle for the synthesis of carbohydrates.
Therefore, in the light reactions of photosynthesis, the electron ejected by P680 in PSII is initially accepted by plastoquinone (PQ). Plastoquinone acts as a mobile electron carrier, shuttling the electron to the next protein complex in the electron transport chain.
In the light reactions of photosynthesis, the electron transport chain plays a crucial role in the conversion of light energy into chemical energy. This process occurs in the thylakoid membrane of the chloroplasts and involves several protein complexes and electron carriers.
1. Photosystem II (PSII)
The electron transport chain starts with the absorption of light energy by the pigment molecule chlorophyll a in Photosystem II (PSII). This energy excites an electron in the chlorophyll molecule, which is then transferred to the primary electron acceptor, P680 (a specialized chlorophyll a molecule).
2. Electron Transfer to Plastoquinone (PQ)
Once the electron is transferred to P680, it becomes highly reactive and is immediately passed on to the electron carrier plastoquinone (PQ). Plastoquinone is a mobile carrier that shuttles electrons between different protein complexes in the thylakoid membrane.
3. Plastoquinone (PQ)
Plastoquinone accepts the high-energy electron from P680 and becomes reduced (PQH2). It then diffuses within the hydrophobic region of the thylakoid membrane to deliver the electron to the next protein complex in the electron transport chain.
4. Cytochrome b6f Complex
The reduced plastoquinone (PQH2) transfers its electron to the cytochrome b6f complex, another protein complex in the thylakoid membrane. This complex uses the electron to pump protons (H+) across the membrane, establishing a proton gradient.
5. Plastocyanin (PC)
The electron is then transferred from the cytochrome b6f complex to plastocyanin (PC), another mobile electron carrier. Plastocyanin shuttles the electron to Photosystem I (PSI), the next protein complex in the electron transport chain.
6. Photosystem I (PSI)
Photosystem I (PSI) absorbs light energy, similar to PSII, and transfers it to a specialized chlorophyll a molecule called P700. The excited electron in P700 is then transferred to another primary electron acceptor.
7. Ferredoxin (Fd)
The electron is passed from the primary electron acceptor of PSI to a small protein called ferredoxin (Fd). Ferredoxin accepts the electron and becomes reduced.
8. NADP+ Reductase
Finally, the reduced ferredoxin (Fd) transfers the electron to an enzyme called NADP+ reductase. This enzyme catalyzes the transfer of the electron to NADP+, along with a proton (H+), to form NADPH, a high-energy molecule that carries the electrons and protons to the Calvin cycle for the synthesis of carbohydrates.
Therefore, in the light reactions of photosynthesis, the electron ejected by P680 in PSII is initially accepted by plastoquinone (PQ). Plastoquinone acts as a mobile electron carrier, shuttling the electron to the next protein complex in the electron transport chain.
Free Test
FREE
| Start Free Test |
Community Answer
The electron ejected by P680 in light reaction is initially accepted b...
Plastoquinone
Attention NEET Students!
To make sure you are not studying endlessly, EduRev has designed NEET study material, with Structured Courses, Videos, & Test Series. Plus get personalized analysis, doubt solving and improvement plans to achieve a great score in NEET.
|
Explore Courses for NEET exam
|
|
Top Courses for NEETView all
The electron ejected by P680 in light reaction is initially accepted bya)Plastoquinoneb)ATPc)Ferredoxind)P-700Correct answer is option 'A'. Can you explain this answer?
Question Description
The electron ejected by P680 in light reaction is initially accepted bya)Plastoquinoneb)ATPc)Ferredoxind)P-700Correct answer is option 'A'. Can you explain this answer? for NEET 2024 is part of NEET preparation. The Question and answers have been prepared according to the NEET exam syllabus. Information about The electron ejected by P680 in light reaction is initially accepted bya)Plastoquinoneb)ATPc)Ferredoxind)P-700Correct answer is option 'A'. Can you explain this answer? covers all topics & solutions for NEET 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for The electron ejected by P680 in light reaction is initially accepted bya)Plastoquinoneb)ATPc)Ferredoxind)P-700Correct answer is option 'A'. Can you explain this answer?.
The electron ejected by P680 in light reaction is initially accepted bya)Plastoquinoneb)ATPc)Ferredoxind)P-700Correct answer is option 'A'. Can you explain this answer? for NEET 2024 is part of NEET preparation. The Question and answers have been prepared according to the NEET exam syllabus. Information about The electron ejected by P680 in light reaction is initially accepted bya)Plastoquinoneb)ATPc)Ferredoxind)P-700Correct answer is option 'A'. Can you explain this answer? covers all topics & solutions for NEET 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for The electron ejected by P680 in light reaction is initially accepted bya)Plastoquinoneb)ATPc)Ferredoxind)P-700Correct answer is option 'A'. Can you explain this answer?.
Solutions for The electron ejected by P680 in light reaction is initially accepted bya)Plastoquinoneb)ATPc)Ferredoxind)P-700Correct answer is option 'A'. Can you explain this answer? in English & in Hindi are available as part of our courses for NEET.
Download more important topics, notes, lectures and mock test series for NEET Exam by signing up for free.
Here you can find the meaning of The electron ejected by P680 in light reaction is initially accepted bya)Plastoquinoneb)ATPc)Ferredoxind)P-700Correct answer is option 'A'. Can you explain this answer? defined & explained in the simplest way possible. Besides giving the explanation of
The electron ejected by P680 in light reaction is initially accepted bya)Plastoquinoneb)ATPc)Ferredoxind)P-700Correct answer is option 'A'. Can you explain this answer?, a detailed solution for The electron ejected by P680 in light reaction is initially accepted bya)Plastoquinoneb)ATPc)Ferredoxind)P-700Correct answer is option 'A'. Can you explain this answer? has been provided alongside types of The electron ejected by P680 in light reaction is initially accepted bya)Plastoquinoneb)ATPc)Ferredoxind)P-700Correct answer is option 'A'. Can you explain this answer? theory, EduRev gives you an
ample number of questions to practice The electron ejected by P680 in light reaction is initially accepted bya)Plastoquinoneb)ATPc)Ferredoxind)P-700Correct answer is option 'A'. Can you explain this answer? tests, examples and also practice NEET tests.
|
|
Explore Courses for NEET exam
|
|
Suggested Free Tests
Signup for Free!
Signup to see your scores go up within 7 days! Learn & Practice with 1000+ FREE Notes, Videos & Tests.
|
© EduRev
|
Education Revolution
|
|
Signup to see your scores
go up within 7 days!
Access 1000+ FREE Docs, Videos and Tests
Takes less than 10 seconds to signup