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2021-05-14

What do photosystem 1 and 2 have in common?

What do photosystem 1 and 2 have in common?

There are two types of photosystems: photosystem I (PSI) and photosystem II (PSII). Both photosystems contain many pigments that help collect light energy, as well as a special pair of chlorophyll molecules found at the core (reaction center) of the photosystem.

Which protein complex contributes electron to replace the lost electron in PSII?

The energized electrons are replaced by oxidizing water to form hydrogen ions and molecular oxygen. to NADPH or are used in non-cyclic electron flow….Structure of complex.

Cofactor Function
Manganese center Also known as the oxygen evolving center, or OEC

What is the concept of two photosystem?

Each photosystem consists of a light-harvesting complex and a core complex. Each core complex contains a reaction centre with the pigment (either P700 or P680) that can be photochemically oxidized, together with electron acceptors and electron donors.

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Does photosystem 2 produce oxygen?

Photosystem II is the first membrane protein complex in oxygenic photosynthetic organisms in nature. It produces atmospheric oxygen to catalyze the photo-oxidation of water by using light energy. It oxidizes two molecules of water into one molecule of molecular oxygen.

What is the function of the first photosystem?

Photosystem I is an integral membrane protein complex that uses light energy to catalyze the transfer of electrons across the thylakoid membrane from plastocyanin to ferredoxin. Ultimately, the electrons that are transferred by Photosystem I are used to produce the high energy carrier NADPH.

What is the function of photosystem?

Photosystems are the functional units for photosynthesis, defined by a particular pigment organization and association patterns, whose work is the absorption and transfer of light energy, which implies transfer of electrons.

What are the major conditions for ps1 functioning?

Answer. Explanation: Photosystem I is an integral membrane protein complex that uses light energy to catalyze the transfer of electrons across the thylakoid membrane from plastocyanin to ferredoxin. Ultimately, the electrons that are transferred by Photosystem I are used to produce the high energy carrier NADPH.

What is the function of the second photosystem?

Photosystem II is the first link in the chain of photosynthesis. It captures photons and uses the energy to extract electrons from water molecules. These electrons are used in several ways.

What is the final product of photosystem 2?

Cards

Term Energy Definition The ability to do work
Term ATP Synthase Definition a protein in the membrane that makes ATP
Term Photophosphorylation Definition adding a phosphate to ADP to form ATP using light
Term What are the product(s) of photosystem II? Definition oxygen ATP

What are the functions of photosystem I and photosystem II in plants?

Photosystem I produces NADPH, which is similar in function to the NADH and FADH2 produced by the citric acid cycle. NADPH is an electron carrier that can donate electrons to other compounds and thus reduce them. Photosystem II produces a proton gradient that drives the synthesis of ATP.

What is the most important function of PS II?

The most important of PS II is splitting of water and evolution of molecular oxygen.

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Where does photosystem 2 get its electrons?

Photosystem II obtains replacement electrons from water molecules, resulting in their split into hydrogen ions (H+) and oxygen atoms. The oxygen atoms combine to form molecular oxygen (O2), which is released into the atmosphere. The hydrogen ions are released into the lumen.

What is the structure and function of a photosystem?

Summary. Photosystem I, a membrane protein complex found in all oxygenic photosynthetic organisms, uses light energy to transfer electrons from plastocyanin to ferredoxin. Light energy captured by antenna chlorophylls is transferred rapidly to the primary electron donor, P700.

What are the parts of photosystem?

Photosystems consist of a light-harvesting complex and a reaction center. Pigments in the light-harvesting complex pass light energy to two special chlorophyll a molecules in the reaction center. The light excites an electron from the chlorophyll a pair, which passes to the primary electron acceptor.

What happens with matter in photosystem 1?

The light reaction occurs in two photosystems (units of chlorophyll molecules). Photosystem I obtains replacement electrons from the electron transport chain. ATP provides the energy and NADPH provides the hydrogen atoms needed to drive the subsequent photosynthetic dark reaction, or Calvin cycle.

Why are the photosystem named I and II?

Answer 1: Photosystems I and II are named such because Photosystem I was actually discovered (and named) before Photosystem II, even though Photosystem II comes before Photosystem I during photosynthesis (i.e., Photosystem II precedes Photosystem I in the electron flow of photophosphorylation).

Why is photosystem called P700?

P700, or photosystem I primary donor, is the reaction-center chlorophyll a molecular dimer associated with photosystem I in plants, algae, and cyanobacteria. Its name is derived from the word “pigment”, and the maximal wavelength of light it can absorb, 700 nm, at which the phenomenon of photobleaching would occur.

Is P700 chlorophyll A or B?

P700 is very likely represented by the first pair of chlorophylls, which consist of one chlorophyll a molecule in the B-branch and the C13 epimer of chlorophyll a in the A-branch.

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What is the product of photosystem 1?

ATP

What is the role of P680?

The reaction center chlorophyll (or the primary electron donor) of photosystem II that is most reactive and best in absorbing light at wavelength of 680 nm. P680 is a group of pigments that are excitonically coupled or that act as if the pigments are a single molecule when they absorb a photon.

What is the function of Plastocyanin?

Plastocyanin is a copper-containing protein that mediates electron-transfer. It is found in a variety of plants, where it participates in photosynthesis.

When an electron in P680 is excited?

4.2. Light energy is trapped by PSII causing an electron from P680 to be promoted to a higher energy level (an excited state). This excited electron is rapidly transferred to a primary electron-acceptor molecule that is closely associated with P680.

Can accept and release high energy electrons?

Electron carrier – A compound that can accept a pair of high-energy electrons and transfer them, along with most of their energy, to another molecule, ex : NADP+.

What is a high-energy electron?

High-energy electrons are released from NADH and FADH2, and they move along electron transport chains, like those used in photosynthesis. The electron transport chains are on the inner membrane of the mitochondrion. As the high-energy electrons are transported along the chains, some of their energy is captured.

What happens when compounds lose electrons?

When compounds lose electrons, they lose energy. When compounds gain electrons, they gain energy. In cellular respiration, electrons are not transferred directly from glucose to oxygen. Each electron is coupled with a proton to form a hydrogen atom.

How many ATPS are formed?

This potential is then used to drive ATP synthase and produce ATP from ADP and a phosphate group. Biology textbooks often state that 38 ATP molecules can be made per oxidized glucose molecule during cellular respiration (2 from glycolysis, 2 from the Krebs cycle, and about 34 from the electron transport system).

How many total carbons are lost as acetyl CoA is oxidized?

2