What is the role of ferredoxin?

Ferredoxin (Fd) is found in chloroplasts which mediates electron transfer and contains an iron-sulfur cluster. It is involved in the photosynthesis process where its iron atoms accept or discharge electrons when they are being oxidized or reduced.

1. How does ferredoxin affect photosynthesis?
2. Is ferredoxin an electron carrier?
3. What do you mean by Ferredoxins?
4. How many electrons can ferredoxin carry?
5. What is ferredoxin reducing substance?
6. Is ferredoxin an enzyme?
7. What is the role of ferredoxin in nitrogen fixation?
8. How is ferredoxin reduced?
9. Which of the following element is a component of ferredoxin?
10. Where is ferredoxin located in chloroplast?
11. How many atoms are present in Molybdo ferredoxin?
12. What does the cytochrome complex do?
13. Is ferredoxin organic?
14. Which molecule is formed when the protein ferredoxin transfers electrons to an electron carrier ATP?
15. What is NADPH responsible for?

How does ferredoxin affect photosynthesis?

The chloroplast ferredoxin is involved in both cyclic and non-cyclic photophosphorylation reactions of photosynthesis. ... In non-cyclic photophosphorylation, ferredoxin is the last electron acceptor thus reducing the enzyme NADP⁺ reductase.

Is ferredoxin an electron carrier?

Ferredoxins play a vital role in photosynthesis, fermentation, and aerobic nitrogen fixation. In each of these processes, ferredoxin is an electron carrier, but its chemical constitution is different. To date, there are four main ferredoxins, which are all colored proteins with distinct absorption spectra.

What do you mean by Ferredoxins?

Definition of ferredoxin

: any of a group of iron- and sulfur-containing proteins that function as electron carriers in photosynthetic and nitrogen-fixing organisms and in some anaerobic bacteria.

How many electrons can ferredoxin carry?

When NADP⁺ and a suitable enzyme are present, two ferredoxin molecules, carrying one electron each, transfer two electrons to NADP⁺, which picks up a proton (i.e., a hydrogen ion) and becomes NADPH.

What is ferredoxin reducing substance?

Ferredoxin-reducing substance (FRS), a new electron-transfer component of the photosynthetic electron-transport chain, appears to function on the reducing side of photosystem I. It protects against the inhibition of photosystem I reactions by antibodies specifically inhibiting anthraquinone and NADP reduction.

Is ferredoxin an enzyme?

Ferredoxin: NADP⁺ reductase is the last enzyme in the transfer of electrons during photosynthesis from photosystem I to NADPH. ... FNR is a soluble protein that is found both free in the chloroplast stroma and bound to the thylakoid membrane.

What is the role of ferredoxin in nitrogen fixation?

Biological nitrogen fixation has implications for low cost, environmentally friendly ammonia production. ... Results indicate that the redox protein ferredoxin mediates electron transfer between nitrogenase and the electrode to stimulate ammonia production.

How is ferredoxin reduced?

Ferredoxin is reduced (1) directly by a light-driven reaction; (2) indirectly by ATP-driven reversed electron transport; or (3) by dehydrogenation or oxidative decarboxylation reactions of intermediary metabolism not involving electron transport chains.

Which of the following element is a component of ferredoxin?

Ferredoxin is Fe having electron carrier which participates in photosynthesis. It plays an important role in ETS, photosynthesis and respiration because iron is the part of cytochromes.

Where is ferredoxin located in chloroplast?

FNR is located in three distinct chloroplast pools. In chloroplasts, FNR can be found in soluble stroma, attached to the stroma thylakoids as well as inner envelope membrane. In darkness, FNR forms large protein complexes at the thylakoids together with Tic62 and TROL.

How many atoms are present in Molybdo ferredoxin?

One of the components, molybdo-ferrodoxin, was about 78% pure based on a molybdenum content of 1 atom per molecule and a mol. wt. of 100 000. At this stage of purity it contained per Mo atom 1 atom Mg, 12 atoms of Fe and 3 atoms of sulfide.

What does the cytochrome complex do?

A cytochrome complex plays a key part in electron transport associated with the membranes of the thylakoids in the process of photosynthesis. It accepts electrons from Photosystem II through plastoquinone and contributes to proton transport across the membrane.

Is ferredoxin organic?

Ferredoxins have relatively low-molecular-weight polypeptide chains, require no organic prosthetic group, and often lack the more complex amino acids. In fact, the amino-acid composition in clostridial ferredoxin is close to that found in certain meteorites.

Which molecule is formed when the protein ferredoxin transfers electrons to an electron carrier ATP?

In the presence of light, photosystem I transfers the electrons to a protein called ferrodoxin. The electrons lost by photosystem I are replaced by electrons shuttled from photosystem II. Finally, ferrodoxin transfers the electrons to the electron carrier NADP+, forming the energy storage molecule NADPH.

What is NADPH responsible for?

NADPH is a cofactor, used to donate electrons and a hydrogens to reactions catalyzed by some enzymes. ... As in other reactions, NADPH helps carry electrons and protons driven by sunlight into new carbon-carbon bonds, creating sugar molecules.