CELL RESPIRATION
OXIDATIVE PHOSPHORYLATION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Cytosol
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Mitochondrial outer membrane
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Mitochondrial inner membrane
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Mitochondrial intermembrane space
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Detailed explanation-1: -Energy is released in these “downhill” electron transfers, and several of the protein complexes use the released energy to pump protons from the mitochondrial matrix to the intermembrane space, forming a proton gradient.
Detailed explanation-2: -The answer is (C) from the mitochondrial matrix to the intermembrane space. The NADH and FADH2 molecules are used in the Electron Transport Chain and the transfer of electrons from Complex I to Complex IV causes a pump of protons. The pump of electrons occurs from the mitochondrial matrix to the intermembrane space.
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.
Detailed explanation-4: -The ETC is embedded within the extensive inner membrane of the mitochondrion, in close proximity to the mitochondrial matrix in which the TCA cycle is localized (Fig. 1).
Detailed explanation-5: -The proton pump is present in the biofilm and is a membrane protein that actively transports H+ against the electrochemical potential difference (