Mastering Biology with Pearson eText -- Standalone Access Card -- for Campbell Essential Biology (with Physiology chapters) (6th Edition)
Mastering Biology with Pearson eText -- Standalone Access Card -- for Campbell Essential Biology (with Physiology chapters) (6th Edition)
6th Edition
ISBN: 9780134018614
Author: Eric J. Simon, Jean L. Dickey, Kelly A. Hogan, Jane B. Reece
Publisher: PEARSON
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Chapter 7, Problem 2SQ
Summary Introduction

To determine: The advantage of the light reactions producing NADPH and ATP on the stroma side of the thylakoid membrane.

Introduction:

The light reaction is carried in the thylakoid membrane of the chloroplast. The photosystem unit is present in the thylakoid membrane which involves in the light reaction. The light reaction generates electrons from water and produced energy (ATP and NADPH). ATP is an Adenosine triphosphate is high energy molecules which are present in every cell while NADH is nicotinamide adenine dinucleotide phosphate is a reducing molecule which transfers electrons to other cells.

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In terms of the spatial organization of photosynthesis within the chloroplast, what is the advantage of the light reactions producing NADPH and ATP on the stroma side of the thylakoid membrane?
The light reactions in chloroplasts power the creation of ATP via chemiosmosis. In relation to this process, which of the following is true?  1. ATP synthase breaks ATP down into ADP, creating energy to fuel chemiosmosis.2. Oxygen is used as a source of electrons to replace those lost in photosystem II.3. Chemiosmosis during the light reactions is also used in the reduction of NADPH and FADH2.4. As excited electrons fall back down to a lower energy state, they create a proton gradient that is used to fuel the phosphorylation of ADP.
In the light-dependent reaction of photosynthesis, what specifically happens in the electron transport chain between Photosystem II and Photosystem I? The excited electron accepted by the primary acceptor in Photosystem II is transferred to pheophytin and plastoquinones, then to cytochrome complex, and finally to plastocyanin. Plastocyanin then transfers the electron to the P700 in the reaction center complex of Photosystem I. The excited electron accepted by the primary acceptor in Photosystem I is transferred to pheophytin and plastoquinones, then to cytochrome complex, and finally to plastocyanin. Plastocyanin then transfers the electron to the P700 in the reaction center complex of Photosystem II. The excited electron accepted by the primary acceptor in Photosystem I is transferred to plastocyanin, then to cytochrome complex, and finally to pheophytin and plastoquinones. Plastoquinone then transfers the electron to the P700 in the reaction center complex of Photosystem II.…
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