What is the source of electrons for P700?

What is the source of electrons for P700? Excitation. When photosystem I absorbs light, an electron is excited to a higher energy level in the P700 chlorophyll. The resulting P700 with an excited electron is

What is the source of electrons for P700?

Excitation. When photosystem I absorbs light, an electron is excited to a higher energy level in the P700 chlorophyll. The resulting P700 with an excited electron is designated as P700*, which is a strong reducing agent due to its very negative redox potential of -1.2 V.

Where do replacement electrons for P700 come from?

It’s reaction center pigment is called P700. Transfers electrons ultimately to NADP+, producing NADPH. The lost electrons are replaced by electrons from photosystem II.

Which chemicals inhibit electron flow between P700 and FD?

On the electron acceptor side of PSI, NADP+ is reduced to NADPH with electrons from P700 via ferredoxin (Fd) and Fd-NADP+ reductase (FNR). Photo-oxidized P700 (P700+) is reduced with electrons from PSII via the Cyt b6/f complex and PC (or Cyt c6) in photosynthetic linear electron flow (Jensen et al., 2007).

Which electron carrier is responsible for the direct transfer of electrons to P700?

The primary electron donor, P700, is ultimately reduced by plastocyanin or cytochrome c6.

What is P700 and P680?

The special pair of photosystem I is called P700, while the special pair of photosystem II is called P680. When light is absorbed by one of the pigments in photosystem II, energy is passed inward from pigment to pigment until it reaches the reaction center.

Where does ps1 get its electrons from?

F. Photosystem I. Photosystem I receives electrons from plastocyanin or cytochrome c6 on the lumenal side of the thylakoid membrane and uses light energy to transfer them across the membrane to ferredoxin on the stromal side. It can also function in a cyclic electron transport pathway.

Why is ps2 called P680?

Its name is derived from the word “pigment”, and the maximal wavelength of light it can absorb, 680 nm, at which the phenomenon of photobleaching would occur.

What happens to electrons from PS1?

Where do the electrons from PS1 go? This is done so by energy from the electrons, they undergo ATP synthase, known as proton motive force.