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How is P680 important for photosynthesis?
P680+ is responsible for the oxidation of water to O2.
What do the terms P680 and P700 mean in science?
P680 and P700 refer to the specific wavelengths of light that are absorbed by Photosystem II (P680) and Photosystem I (P700) in the process of photosynthesis. These numbers represent the particular chlorophyll molecule's absorption peaks in each photosystem.
Sunlight excites electrons in the chlorophyll during the what?
Sunlight excites electrons in chlorophyll during the process of photosynthesis, where they are used to convert carbon dioxide and water into glucose and oxygen. This excitation of electrons is a key step in converting light energy into chemical energy that the plant can use for growth and metabolism.
Where do the electrons enter an electrochemical cell?
Electrons enter an electrochemical cell through the anode. The anode is where oxidation occurs, leading to the release of electrons that flow through the external circuit to the cathode.
How is electron transport similar to electricity?
Electron transport is electricity. Electricity is the flowing of electrons along a substrate such as copper. Electrons will move from one source to another source. In household electricity the electrons travel along the path and back to the original source.
The chlorophyll known as P680 has its electron holes filled by electrons from what a. photosystem I. b. photosystem II c. water d. NADPH e. accessory pigments?
b. photosystem II. Electrons from water are used to fill the electron holes of P680 in photosystem II during the light-dependent reactions of photosynthesis.
What photosystem splits water?
Photosystem II is responsible for splitting water during the light reactions of photosynthesis. This process releases oxygen as a byproduct and provides electrons for the electron transport chain.
What does a plant do with a water?
When the light cascade finally releases the P680 electrons to the primary electron acceptor of the reaction complex those electrons must be replaced. The plant has an enzyme that preforms photolysis on water, splitting it, so that two electrons are fed one at a time into the p680 chlorophylls as replacement electrons for those they have released to the primary electron acceptor.
What is the energy that excites p680 and p700 is supplied by what?
The energy that excites P680 and P700 in photosystem II and photosystem I respectively is supplied by sunlight. More specifically, it is the photons of light energy absorbed by chlorophyll molecules within these photosystems that excites the electrons in P680 and P700 to higher energy states, initiating the process of photosynthesis.
How is P680 important for photosynthesis?
P680+ is responsible for the oxidation of water to O2.
Which of the following statements regarding events in the functioning of photosystem II is false?
Statement: "The splitting of water molecules in the oxygen-evolving complex results in the release of oxygen gas." This statement is false. The splitting of water molecules in the oxygen-evolving complex results in the release of protons and electrons, not oxygen gas.
What converts sunlight into sugars?
Photosynthesis that is where The energy-fixing reaction of photosynthesis begins when light is absorbed in photosystem II in the thylakoid membranes. The energy of the sunlight, captured in the P680 reaction center, activates electrons to jump out of the chlorophyll molecules in the reaction center. These electrons pass through a series of cytochromes in the nearby electron-transport system. After passing through the electron transport system, the energy-rich electrons eventually enter photosystem 1. Some of the energy of the electron is lost as the electron moves along the chain of acceptors, but a portion of the energy pumps protons across the thylakoid membrane, and this pumping sets up the potential for chemiosmosis. The spent electrons from P680 enter the P700 reaction center in photosystem I. Sunlight now activates the electrons, which receive a second boost out of the chlorophyll molecules. There they reach a high energy level. Now the electrons progress through a second electron transport system, but this time there is no proton pumping. Rather, the energy reduces NADP. This reduction occurs as two electrons join NADP and energize the molecule. Because NADP acquires two negatively charged electrons, it attracts two positively charged protons to balance the charges. Consequently, the NADP molecule is reduced to NADPH, a molecule that contains much energy. Because electrons have flowed out of the P680 reaction center, the chlorophyll molecules are left without a certain number of electrons. Electrons secured from water molecules replace these electrons. Each split water molecule releases two electrons that enter the chlorophyll molecules to replace those lost. The split water molecules also release two protons that enter the cytoplasm near the thylakoid and are available to increase the chemiosmotic gradient.
Why is P680 of photosystem II said to be the strongest biological oxidizing agent?
P680 of photosystem II is considered the strongest biological oxidizing agent because it has a high reduction potential, allowing it to efficiently extract electrons from water during photosynthesis. This ability enables P680 to initiate the electron transport chain by oxidizing water and generating oxygen as a byproduct.
What is electical circuits?
It is a way in which electrons from a voltage or current source stream. Electric current stream in a shut way is called an electric circuit. The point where those electrons enter an electrical circuit is known as the source of electrons.
Can the Pioneer CDX-P680 6-Disc CD Changer play Mp3 files?
The Pioneer CD-P680 can play MP3 files, as well as WMA files.
What do the terms P680 and P700 mean in science?
P680 and P700 refer to the specific wavelengths of light that are absorbed by Photosystem II (P680) and Photosystem I (P700) in the process of photosynthesis. These numbers represent the particular chlorophyll molecule's absorption peaks in each photosystem.
What molecule is split during the light reaction of photosynthesis?
A molecule of water is split producing: 2H+ which contributes to the increase in proton gradient, 2 electrons reducing P680+ to P680, and an oxygen atom which later combines with another oxygen atom to form O2.
