P680 is said to be the strongest biological oxidizing agent. The strong oxidizing potential of P680 is essential for its function because it ________. obtains electrons from the oxygen atom in a water molecule is the receptor for the most excited electron in either photosystem of photosynthesis transfers its electrons to reduce NADP to NADPH is the molecule that transfers electrons to plastoquinone (Pq) of the electron transfer system

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29-10-2021
Biology

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P680 is said to be the strongest biological oxidizing agent. The strong oxidizing potential of P680 is essential for its function because it ________. obtains electrons from the oxygen atom in a water molecule is the receptor for the most excited electron in either photosystem of photosynthesis transfers its electrons to reduce NADP to NADPH is the molecule that transfers electrons to plastoquinone (Pq) of the electron transfer system

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marianaegarciaperedo marianaegarciaperedo · Answer 1 · 2021-11-06T04:09:05+01:00

P680 is the photosystem II involved in the photosynthetic noncyclic pathway. It is the strongest biological oxidizing agent because it has a stronger affinity for electrons than O₂. It can oxidize the water molecule.

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P680 refers to the photosystem II of the photosynthetic electron transporter chain.

It is said to be the strongest biological oxidizing agent because it has a stronger affinity for electrons than oxygen. I

It can oxidize the water molecule to get the electrons, releasing oxygen and protons.

Let us review the photosynthetic electrón flow from water to NADPH.

1. Luminous energy is trapped by chlorophyll in Photosystem II.

2. When the pigment molecules absorb light, electrons provided by water molecules get in a higher energy level.

3. The excited electrons go through the electron transport chain from Photosystem II to a less energetic level in photosystem I.

4. When the excited electrons leave photosystem II, they are replaced by new electrons extracted from the water molecules.

5. Luminous energy absorbed move the electrons from the photosystem I to another electron acceptor, from where they get transported again and used to produce NADPH molecules.

6. When electrons leave Photosystem I, they are replaced by new electrons coming from photosystem II.

7. When the water molecule breaks down, hydrogen ions remain in the thylakoid lumen, from where they are pumped to the stroma by the ATP synthase.

8. The released energy is used to produce ATP molecules.

9. Hydrogen ions go back from the stroma to the thylakoid compartment.

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