Essential Cell Biology
Essential Cell Biology
4th Edition
ISBN: 9780815344544
Author: Keith Roberts, Karen Hopkin, Alexander D Johnson, Martin Raff, Dennis Bray, Bruce Alberts, Julian Lewis, Peter Walter
Publisher: TAYLOR
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Chapter 14, Problem 11Q

A.

Summary Introduction

To explain: The given statement “after an electron has been removed by light, the affinity for electrons of the positively charged chlorophyll in the reaction centre of the first photosystem (photo system II) are even greater than the electron affinity of O2 ”.

Concept introduction: Photosystems that are present in the thylakoid membrane of plants are the functional and structural units of protein complexes that are involved in the photosynthesis process. It consists of two reaction centres, in which the photosystem I (P700) and photosystem II (p680). For the oxygenic photosynthesis, both the photosystems are required.

B.

Summary Introduction

To explain: The given statement “Photosynthesis is the light-driven transfer of an electron from chlorophyll to a second molecule that normally has a much lower affinity for electrons”.

Concept introduction: Photosystems that are present in the thylakoid membrane of plants are the functional and structural units of protein complexes that are involved in the photosynthesis process. It consists of two reaction centres, in which the photosystem I (P700) and photosystem II (p680). For the oxygenic photosynthesis, both the photosystems are required.

C.

Summary Introduction

To explain: The given statement “Because it requires the removal of four electrons to release one O2 molecule from two H2O molecules , the water splitting enzyme in photo system II has to keep the reaction intermediates tightly bound so as to prevent partly reduced, and therefore hazardous, superoxide radicals from escaping” .

Concept introduction: Photosystems that are present in the thylakoid membrane of plants are the functional and structural units of protein complexes that are involved in the photosynthesis process. It consists of two reaction centres, in which the photosystem I (P700) and photosystem II (p680). For the oxygenic photosynthesis, both the photosystems are required.

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The Cell Membrane; Author: The Organic Chemistry Tutor;https://www.youtube.com/watch?v=AsffT7XIXbA;License: Standard youtube license