Question

Place the following steps of the light reaction in the correct order: A. A primary electron acceptor grabs the excited electrons from the first photosystem and transfers them to the first electron transport chain. B. To replace the excited electrons, electrons from the first electron transport chain are used. C. An electron in chlorophyll in the first photosystem is excited when hit by a light photon. D. Electrons travel down the second electron transport chain. E. Electrons are passed to NADP+ to create NADPH (an electron carrier) F. As electrons travel through the electron transport chain, they release energy which is used to make ATP from ADP (via a proton pump & ATP synthase). G. To replace the excited electrons, water molecules are split, creating O2 and H+ ions as byproducts. H. An electron in chlorophyll in the second photosystem is excited when hit by a light photon. I. A primary electron acceptor grabs the excited electrons from the second photosystem and transfers them to the second electron transport chain.

          Place the following steps of the light reaction in the correct order:
A. A primary electron acceptor grabs the excited electrons from the first photosystem and transfers them to the first electron transport chain.
B. To replace the excited electrons, electrons from the first electron transport chain are used.
C. An electron in chlorophyll in the first photosystem is excited when hit by a light photon.
D. Electrons travel down the second electron transport chain.
E. Electrons are passed to NADP+ to create NADPH (an electron carrier)
F. As electrons travel through the electron transport chain, they release energy which is used to make ATP from ADP (via a proton pump & ATP synthase).
G. To replace the excited electrons, water molecules are split, creating O2 and H+ ions as byproducts.
H. An electron in chlorophyll in the second photosystem is excited when hit by a light photon.
I. A primary electron acceptor grabs the excited electrons from the second photosystem and transfers them to the second electron transport chain.

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Place the following steps of the light reaction in the correct order:
A. A primary electron acceptor grabs the excited electrons from the first photosystem and transfers them to the first electron transport chain.
B. To replace the excited electrons, electrons from the first electron transport chain are used.
C. An electron in chlorophyll in the first photosystem is excited when hit by a light photon.
D. Electrons travel down the second electron transport chain.
E. Electrons are passed to NADP+ to create NADPH (an electron carrier)
F. As electrons travel through the electron transport chain, they release energy which is used to make ATP from ADP (via a proton pump ATP synthase).
G. To replace the excited electrons, water molecules are split, creating O2 and H+ ions as byproducts.
H. An electron in chlorophyll in the second photosystem is excited when hit by a light photon.
I. A primary electron acceptor grabs the excited electrons from the second photosystem and transfers them to the second electron transport chain.

Added by Brianna N.

Biology for AP Courses

Julianne Zedalis, John Eggebrecht

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Solved by Expert Dominador Tan

12/15/2021

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Place the following steps of the light reaction in the correct order: A. A primary electron acceptor grabs the excited electrons from the first photosystem and transfers them to the first electron transport chain. B. To replace the excited electrons, electrons from the first electron transport chain are used. C. An electron in chlorophyll in the first photosystem is excited when hit by a light photon. D. Electrons travel down the second electron transport chain. E. Electrons are passed to NADP+ to create NADPH (an electron carrier) F. As electrons travel through the electron transport chain, they release energy which is used to make ATP from ADP (via a proton pump & ATP synthase). G. To replace the excited electrons, water molecules are split, creating O2 and H+ ions as byproducts. H. An electron in chlorophyll in the second photosystem is excited when hit by a light photon. I. A primary electron acceptor grabs the excited electrons from the second photosystem and transfers them to the second electron transport chain.

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Transcript

00:01 The light -dependent reactions use light energy to make molecules needed for the next stage of the photosynthesis.

00:11 The energy storage molecule atp and the reduced electron carrier known as n -a -d -p in plants, the light reaction take place in the thylacoid membrane.

00:26 So this is the tyloquoid membrane of organelles called as chloroplast.

00:34 Photosystems, large complexes of proteins and pigments that are optimized to harvest light play a key role in the light reaction.

00:46 There are two types of photosynthesis.

00:48 We have photosystem 1 and we have photo system 2.

00:53 Both photo systems contain many pigments that help collect.

00:57 Light energy as well as a special pair of chlorophyll molecule found at the core or the reaction center of the photo system.

01:07 The special pair of photosystem 1 is called as p -700, while the special pair of photosystem 2 is called p680.

01:18 We should also know what are the main steps in the process.

01:22 The first one is the light absorption in photosystem 2.

01:32 The electrons get excited from photosystem 2 or your p680 and accepted by an electron acceptor.

01:43 The second step would be the splitting.

01:47 So there will be a splitting of water molecule.

01:54 This electron is replaced by water and water gets split into hydrogen ions and oxygen.

02:05 And the third step would be atp synthesis...

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