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Photosystem 1 has chlorophyll a molecule which absorbs maximum light of 700 nm and is called P700 whereas photosystem 2 has chlorophyll a molecule which absorbs light of 680 nm and is called P680.
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∙ 12y ago
Wiki User
∙ 8y ago* The chlorophyll molecules in the reaction center of photosystem II are P680 (sensitive to wavelengths up to about 680 nm), whereas those in photosystem I are P700, which can therefore respond to slighter longer wavelengths.
* Photosystem II, unlike photosystem I, contains plastoquinone, which passes the energetic electron to cytochromes b6 and f, but photosystem I passes the electron to ferredoxin.
* In non-cyclic photophosphorylation, photosystem II is associated with the photolysis of water and subsequent synthesis of ATP; photosystem I is associated with the conversion of NADP+ to NADPH.
* In cyclic photophosphorylation, only photosystem I produces an energized electron on receipt of a photon. Instead of producing NADPH, this electron travels to plastoquinone, and then to cytochromes b6 and f, as in the non-cyclic process.
Both systems are light dependent. Both systems use light
energy to energize electrons. One difference is that
water molecules are split in photosystem II, but not
in photosystem I. In photosystem II, ADP is converted
into ATP.
Students who are using this as a resource for APEX coursework should note that you may want to paraphrase so your teachers can't google your responses
Wiki User
∙ 13y agoEach preferentially absorbs slightly different wavelengths of light.
Wiki User
∙ 10y agod.the optimal wavelegthof absorption in the reactioncentre.
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∙ 9y agodifference between photosysten 1 and 2
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Where do electrons for photosystem II come from?
Water. Photosystem II uses light energy to catalyze the following reaction: 2 H2O --> 4H+ + 4e- + O2 The electrons from water pass through photosystem II to reduce quinone molecules, which shuttle the electrons to the next step of the photosynthetic reaction chain.
Which complex or enzyme of photosynthesis consumes h2o?
photosystem II
Where do the electron get their energy in photosystem 1?
They pass through a series of compounds to photosystem I, losing energy along the way. Photosystem I, like photosystem II, emits high-energy electrons in the light, and the electrons from photosystem II replace these. Photosystem II contains chlorophyll molecules. When a photon (quantum of light) reaches one of these chlorophyll molecules, the light energy activates an electron. This is then passed to the reaction center of the photosystem, where there are two molecules of chlorophyll P680. These pass the electrons to plastoquinone, which, like the chlorophylls, is embedded in the thylakoid membrane. The plastoquinone changes its position within the membrane, and passes the electrons to cytochromes b6 and f. At this stage the electrons part with a significant proportion of their energy, which is used to pump protons (H+) into the thylakoid lumen. These protons will later be used to generate ATP by chemiosmosis. The electrons now pass to plastocyanin, which is outside the membrane on the lumen side. Photosystem I is affected by light in much the same way as photosystem II. Chlorophyll P700 passes an activated electron to ferredoxin, which is in the stroma (the liquid outside the thylakoid). Ferredoxin in turn passes the electrons on, reducing NADP+ to NADPH + H+. Photosystem I accepts electrons from plastocyanin. So, effectively, photosystem II donates electrons to photosystem I, to replace those lost from photosystem I in sunlight. How does photosystem II recover electrons? When it loses an electron, photosystem II becomes an oxidizing agent, and splits water: 2H2O forms 4H+ + 4e- + O2. The electrons return photosystem II to its original state, and the protons add to the H+ concentration in the thylakoid lumen, for later use in chemiosmosis. The oxygen diffuses away.
What will most likely happen if the hydrogen pump protein in photosystem II is not taking enough H ions into the thylakoid?
A decrease in the formation of ATP
Is dehydration of hydrated copper ii sulfate exothermic reaction or endothermic reaction?
exothermic
Which is a role of photosystem ii in the light reaction?
Splitting H2O (Apex)
Which is a reactant is for the reaction that is powered by sun hitting photosystem II?
ADP
Which is a reactant for the reaction that is powered by sun hitting photosystem II?
ADP
Water participates directly in the light reactions of photosynthesis by?
Water participates directly in the light reactions of photosynthesis by donating electrons to photosystem II. Photosystem I and photosystem II both contain chlorophyll as molecules.
Why did photosystem II evolve first?
This is a speculative area! The most detailed studies and reasoning relevant to this question are perhaps those of Nathan Nelson, who has used genomic analyses of Eubacteria, Archaea, and eukaryotes to draw up a tentative evolutionary tree of photosynthetic reaction centers. His conclusion is that photosystems I and II, or rather, reaction centers of these two types, had a common origin about 2.5 Ga (billion years ago). - - - photosystem II - - - It was Kodak that invented the first, ever, photosystem for every man to use. In those days you needed to buy the camera and after having taken all the shots, you simply returned the camera (intact) to Kodak. Kodak would then make prints of your photos and return it. --- But I think you meant the photosystem used in photosynthesis lol photosystem 1 was discovered first, but it does not mean that it evolved first. Photosystem 2 is actually first in the process of capturing light energy. But as you can see, the answer is mainly a mystery, just like "Which came first, the chicken or the egg?" Hope this helped --
What happen to the light energy that is trapped by the chloroplast during the first stage of photosynthesis?
Light energy is not exactly trapped. The light energy excites the electron in the reaction centres of photosystem I and photosystem II. The electron excites and transfers to the electron transport chain ( chain of electron carriers), this produces ATP. Then the electron of photosystem II is transferred by photosystem I and the electron of the photosystem I is used with H+ and NADP to form NADPH. Photosystem II gets back an electron from photolysis of water.
Where do electrons for photosystem II come from?
Water. Photosystem II uses light energy to catalyze the following reaction: 2 H2O --> 4H+ + 4e- + O2 The electrons from water pass through photosystem II to reduce quinone molecules, which shuttle the electrons to the next step of the photosynthetic reaction chain.
What is the waters role in the reaction of photosynthesis?
Water is split to have its electrons replace the excited electron of chlorophyll, then enters photosystem II.
Which steps occur in photosystem II?
ADP takes on energy and a phosphate to produce ATP in photosystem II.
Where in the chloroplast is the chemiosmotic gradient developed?
In the thylakoid between photosystem II and photosystem I.
What two types of reactions occur during photosynthesis?
The two reactions which occur during photosynthesis are light reaction and dark reaction. Light reaction takes place only in the presence of light. Dark reaction can occur with or without light.
What is the photosystem II of photosynthesis?
Splitting H2O
