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Photosystem


Photosystems are made of several protein subunits, as well as hundreds of cofactors, and act as large complex.
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Photosystem
(Redirected from Photosystem II)
In the process of photosynthesis, light is absorbed by a photosystem (ancient Greek: phos = light and systema = assembly) to begin an energy-producing reaction.
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Photosystem II is also a complex of
> 20 different protein molecules bound to
50 or more chlorophyll a molecules ...
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Photosystem I evolved very early; photosystem II evolved later.
Details of the Light-Dependent Reactions
Photosystem II ...
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Photosystems are arrangements of chlorophyll and other pigments packed into thylakoids. Many Prokaryotes have only one photosystem, Photosystem II (so numbered because, while it was most likely the first to evolve, it was the second one discovered).
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photosystem
[Gk. photos, light + systema, that which is put together]
The light-harvesting unit in photosynthesis, located on the thylakoid membrane of the chloroplast and consisting of the antenna complex, the reaction-center chlorophyll a, ...
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photosystem: the site within the chloroplast in which sunlight is captured; includes the pigment molecules, proton pumps, enzymes, coenzymes, and cytochromes.
phototropism: the bending and turning of the plant stem toward a light source.
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photosystems - multiprotein complexes that catalyze the conversion of the light energy captured in excited chlorophyll molecules to useful forms ...
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photosystem I The second part of the Z-scheme in which a chlorophyll a molecule absorbs most effectively at 700 nm.
photosystem II The first part of the Z-scheme in which the chlorophyll a molecule absorbs most effectively at 680 nm.
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After the advent of photosystem II, oxygen levels increased. Dissolved oxygen in the oceans increased as well as atmospheric oxygen. This is sometimes called the oxygen holocaust.
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The inhibitor binds to a site on the enzyme other than the active site noncyclic electron flow The light-induced flow of electrons from water to NADP in oxygen-evolving photosynthesis involving both photosystems I and II.
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A large number of Synechocystis mutants has been generated that are altered in one of the photosystems or in one or more of the respiratory complexes, ...
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