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No, PS I and PS II are part of the first stage of photosynthesis, the light reactions. The Calvin cycle is the second stage of photosynthesis and does utilize the photosystems.

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Photosystem II (PS II) and Photosystem I (PS I) occur in the thylakoid membranes of chloroplasts in plant cells. PS II is located first in the light-dependent reactions of photosynthesis, capturing light energy to split water molecules and release oxygen. PS I follows, absorbing light to facilitate the production of NADPH, which is used in the light-independent reactions. Together, they play crucial roles in converting light energy into chemical energy.


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What is it called when electrons transport between PS II and PS I which generatees a proton gradient?

The process of electron transport between Photosystem II (PS II) and Photosystem I (PS I) that generates a proton gradient is known as the electron transport chain (ETC). During this process, electrons are passed through a series of proteins and cofactors, leading to the pumping of protons into the thylakoid lumen, creating a proton motive force. This gradient is then utilized by ATP synthase to produce ATP during photophosphorylation.


Is the energy from sunlight trapped by chlorophyll located in the electron transport chain?

No, the energy trapped by chlorophyll is located in photosystem I and II. Light energy is first captured by PS II and an electron is then transferred to a primary electron acceptor known as plastoquinone. Pq then transfers it's electron to the cytochrome complex that transfers its energy to the electron transport system which passes it on to plastocyanin which in turn gives its electron to PS I where it is re-excited by photons. This process is known as the electron transport but the energy captured by chlorophyll is located in the photosystems.


What is the difference between photosynthesis I and photosynthesis II?

Photosynthesis II or PS II (photosystem II) comes before PS I. PSII uses a pair of P680 chlorophyll a, while PSI uses a pair of P700 chlorophyll a. These systems populate the thylakoid membrane.First, light hits PS II and excites its pigment molecules and the energy bounces off the pigment molecules until it gets to the P680 chlorophyll and excites its electrons which then causes it to give off an electron to the Primary electron acceptor.Now the pair of P680 is deprived of an electron, this is where water comes nto play. An enzyme catalyzes the splitting of water to produce O2 and two electrons, these electrons supply the ones that the pair of P680 chlorophyll gave away, this enables the P680 to be able to get excited again and again without being deprived of electrons.Back to the primary acceptor, the excited electron passes from PS II to PS I via the Electron Transport chain. This produces ATP.The electron then is at the P700 pair of chlorophyll a's of PS I which excites it and it gives off that electron to another primary electron acceptor which transports its electrons via ETC as well, but the final electron acceptor is NADP+, which with the electron becomes: NADPH.


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