PHOTOSYNTHESIS
LIGHT DEPENDENT REACTIONS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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They use PS II
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They use the chlorophyll in the membrane
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Hydrogen ions do not actually flow from the thylakoid space to the stroma.
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They flow from a high area of concentration to a low area of concentration using ATP Synthase.
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Detailed explanation-1: -They flow passively from high to low concentration via facilitated diffusion. As they flow through ATP synthase, the enzyme spins and produces ATP.
Detailed explanation-2: -The ions flow through ATP synthase from the thylakoid space into the stroma in a process called chemiosmosis to form molecules of ATP, which are used for the formation of sugar molecules in the second stage of photosynthesis.
Detailed explanation-3: -During electron transport, energy is used to pump hydrogen ions across the mitochondrial inner membrane, from the matrix into the intermembrane space. A chemiosmotic gradient causes hy drogen ions to flow back across the mitochondrial membrane into the matrix, through ATP synthase, producing ATP.
Detailed explanation-4: -The flow of hydrogen ions through ATP synthase is called chemiosmosis, because the ions move from an area of high to low concentration through a semi-permeable structure.
Detailed explanation-5: -Energy from the electrons is used by proteins in the electron transport chain to pump H+ ions from the stroma into the thylakoid space.