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Photosystem I and II are two types of reaction centers found in thylakoid membranes, which are the sites of protein synthesis located in the leaves of plants.

The function of reaction centers is to convert light energy into chemical energy (photophosphorylation).

Now the difference between photosystem I and photosystem II is that each is able to absorb a particular wavelength.

Photosystem 2 has a maximum absorption at a wavelength of 680 nanometers.

Photosystem 1 best absorbs light at a wavelength of 700 nanometers.

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What fills the electron hole in photsystem 1 and 2?

In photosystem 2- water(photolysis) In photosystem 1 - electron from photosystem 2


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Photosystem 2 happens in photosynthesis before photosystem 1. However they are numbered in order of how they were discovered. Photosystem 1 was discovered before photosystem 2. In photosynthesis the order of them is 2 then 1. meaning that photosystem 1 was discovered 1st but photosystem 2 happens 1st in photosynthesis


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Photosystems I and II are both in the thylakoid membranes of the chloroplast.


What is a role of photosystem 2 in light reactions?

Photosystem two produces O2, ATP, and NADP+


What protein complex absorbs in energy that used to produce NADPH?

Photosystem 1


What happens to electrons when pigments in photosystem absorb lights?

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What Photosystem is older in terms of evolutionary history?

Photosystem II is older in terms of evolutionary history compared to Photosystem I. Photosystem II is thought to have evolved before Photosystem I as it evolved to oxidize water in order to provide electrons for the electron transport chain, which Photosystem I then uses to reduce NADP+ to NADPH.


Which sentence best describes what happens after sunlight hits photo system 2?

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