Table of Contents
Where do Photosystem II electrons come from?
The light excites an electron from the chlorophyll a pair, which passes to the primary electron acceptor. The excited electron must then be replaced. In (a) photosystem II, the electron comes from the splitting of water, which releases oxygen as a waste product.
Which is a role of Photosystem II in the light reactions?
Photosystem II (PSII) is a membrane protein supercomplex that executes the initial reaction of photosynthesis in higher plants, algae, and cyanobacteria. It captures the light from the sun to catalyze a transmembrane charge separation.
What happens to electrons when pigments in photosystem II absorb light quizlet?
A pigment molecule absorbs a photon of light, passing its energy to other pigment molecules until it reaches Photosystem II. In Photosystem II, it excites an electron of chlorophyll P680 to a higher energy level. The electron is captured by the primary electron acceptor.
What happens to electrons in a chlorophyll molecule in photosystem II after they have absorbed light energy?
When light is absorbed by one of the many pigments in photosystem II, energy is passed inward from pigment to pigment until it reaches the reaction center. The high-energy electron is passed to an acceptor molecule and replaced with an electron from water.
How is photosystem II differ from photosystem I?
Photosystem I (PS I) and photosystem II (PS II) are two multi-subunit membrane-protein complexes involved in oxygenic photosynthesis. The main difference between photosystem 1 and 2 is that PS I absorbs longer wavelengths of light (>680 nm) whereas PS II absorbs shorter wavelengths of light (<680 nm).
How does wavelength of light affect photosynthesis?
Special pigments in chloroplasts of plant cells absorb the energy of certain wavelengths of light, causing a molecular chain reaction known as the light-dependent reactions of photosynthesis. The best wavelengths of visible light for photosynthesis fall within the blue range (425–450 nm) and red range (600–700 nm).
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