Is NADPH an electron acceptor?

Published by Charlie Davidson on

Is NADPH an electron acceptor?

There are four major protein complexes in the thylakoid membrane: Photosystem II (PSII), Cytochrome b6f complex, Photosystem I (PSI), and ATP synthase. These four complexes work together to ultimately create the products ATP and NADPH. The final electron acceptor is NADP.

What is the acceptor molecule in photosynthesis?

For example, the primary electron acceptor molecule for photosynthesis is nicotinamide adenine dinucleotide phosphate (NADP).

Where is NADPH during electron transport?

NADPH is formed on the stromal side of the thylakoid membrane, so it is released into the stroma. In a process called non-cyclic photophosphorylation (the “standard” form of the light-dependent reactions), electrons are removed from water and passed through PSII and PSI before ending up in NADPH.

What photosystem gives electrons to NADP+?

photosystem II
The plastoquinol (QH2) produced by photosystem II contributes its electrons to continue the electron chain that terminates at photosystem I. These electrons are transferred, one at a time, to plastocyanin (Pc), a copper protein in the thylakoid lumen.

Is CO2 an electron acceptor?

Carbon dioxide is used as terminal electron acceptor by methanogenic Archaea for energy generation, yielding methane as final product and by different groups of prokaryotes to produce acetate.

Is oxygen the final electron acceptor?

Oxygen is the final electron acceptor in this respiratory cascade, and its reduction to water is used as a vehicle by which to clear the mitochondrial chain of low-energy, spent electrons.

Is CO2 an electron acceptor in photosynthesis?

2-, NO3 -, or CO2 is the final electron acceptor. maintaining balanced amounts of oxidants and reductants necessary for diverse metabolic processes.

What is a acceptor molecule?

A molecule that receives or accepts electrons from another molecule during a redox reaction. Supplement. An electron acceptor is an oxidizing agent and is itself reduced during the process of redox reaction. Examples of acceptors include oxygen, nitrate, iron (III), manganese (IV), sulfate, carbon dioxide, etc.

Where does the electron acceptor molecule transfer electrons?

The reaction center chlorophyll then transfers its high-energy electron to an acceptor molecule in an electron transport chain. High-energy electrons are then transferred through a series of membrane carriers, coupled to the synthesis of ATP and NADPH.

Does photosystem 1 contain an electron acceptor?

F. Photosystem I. As in Photosystem II, light is harvested by antenna complexes, and the primary light reaction is a charge separation beginning stabilized by transfer of an electron to a quinone, but in Photosystem I the terminal electron acceptor is an FeS cluster, which permits reduction of ferredoxin.

What is produced in cyclic electron flow?

Under certain conditions, the photoexcited electrons take an alternative path called cyclic electron flow, which uses photosystem I (P700) but not photosystem II (P680). This process produces no NADPH and no O2, but it does make ATP. This is called cyclic photophosphorylation.

What is the difference between NADP+ and Nadph?

What is the diff between NADP+ and NADPH? NADPH is an energy molecule. NADP+ is an e- acceptor. It turns into NADPH by accepting both e- and H+ molecules.

Which is the electron acceptor in the light dependent reaction series?

The electron acceptor in the light-dependent reaction series of photosynthesis is NADP. Energy from the sun causes chlorophyll to lose an electron. This electron travels through a cascade of reactions to ultimately convert a molecule of NADP to NADPH.

What is the fluorescence of NADPH in aqueous solution?

NADPH in aqueous solution excited at the nicotinamide absorbance of ~335 nm (near UV) has a fluorescence emission which peaks at 445-460 nm (violet to blue). NADP + has no appreciable fluorescence.

How is the NADPH system used in anabolic pathways?

NADPH is also used for anabolic pathways, such as cholesterol synthesis, steroid synthesis, ascorbic acid synthesis, xylitol synthesis, cytosolic fatty acid synthesis and microsomal fatty acid chain elongation . The NADPH system is also responsible for generating free radicals in immune cells by NADPH oxidase.

Which is the final electron acceptor in photosynthesis?

The light-dependent reactions begin in photosystem II. When a chlorophyll a molecule within the reaction center of PSII absorbs a photon, an electron in this molecule attains an excited energy level. The final electron acceptor is NADP.

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