Table of Contents
What is needed in photosystem I to excite the electrons?
The reaction center chlorophyll of photosystem I transfers its excited electrons through a series of carriers to ferrodoxin, a small protein on the stromal side of the thylakoid membrane. The enzyme NADP reductase then transfers electrons from ferrodoxin to NADP+, generating NADPH.
How do the electrons in photosystem II & photosystem I become excited?
Photosynthetic eukaryotes and cyanobacteria have two photosystems – Photosystem II and Photosystem I. Light energy causes the excitation and loss of an electron from a PSII reaction center chlorophyll (P680). Water is oxidized to replace the lost electron, generating H+ ions and oxygen (O-2) ions.
Where does the energy that excites electrons in photosystem I come from?
Explanation: Photosystem I is really the second photosystem. When light photons excite the pigments in the light-harvesting complexes of the photosystem, their electrons get excited. These electrons come from the process the directly proceeds Photosystem I, which is the electron transport chain.
What is a photosystem in relation to photosynthesis?
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. Physically, photosystems are found in the thylakoid membranes.
What happens during 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. First, when the electrons are removed, the water molecule is broken into oxygen gas, which bubbles away, and hydrogen ions, which are used to power ATP synthesis.
What happens when electrons get excited in photosystem I?
NADP+ (NADPH) is the result of the electrons which combine to produce an energy carrying molecule. This happens when the electrons get excited in photosystem I. Took the quiz!
What do electrons combine to produce an energy-carrying molecule?
Electrons are excited in photosystem I. With what do these electrons combine to produce an energy-carrying molecule? A.ADP NADP+ (NADPH) is the result of the electrons which combine to produce an energy carrying molecule. This happens when the electrons get excited in photosystem I.
How does the electron transport chain work in photosynthesis?
The Electron Transport Chain. While at photosystem II and I, the electrons gather energy from sunlight. How do they do that? Chlorophyll, which is present in the photosystems, soaks up light energy. The energized electrons are then used to make NADPH. The electron transport chain is a series of molecules that accept or donate electrons easily.
Where do electrons travel in the electron transport chain?
Photosystem I was discovered first. Later, photosystem II was discovered and found to be earlier in the electron transport chain. But it was too late, the name stuck. Electrons first travel through photosystem II and then photosystem I. While at photosystem II and I, the electrons gather energy from sunlight. How do they do that?