Oxidative Phosphorylation Test Questions with Verified
Answers Rated A
Describe the region in Model 1 where the highest What molecule is the final electron acceptor after the
concentration of hydrogen ion (H+) is located. - electron has moved through the electron transport
ANSWER -The region in Model 1 where the chain? - ANSWER -Oxygen acts as the final
hydrogen ion concentration is located is the electron acceptor and accepts the electron after it has
intermembrane space which is in between the outer moved through the electron transport chain
mitochondrial membrane and the inner mitochondrial
membrane.
What compound is formed as a final product of the
electron transport chain? - ANSWER -2 water
According to Model 1, how do the hydrogen ions molecules are formed as the final product of the
reach this area (inter membrane space)? - electron transport chain.
ANSWER -According to Model 1, hydrogen
ions reach this area through embedded protein
channels (powered by electron transport chains) that Is any ATP produced in the electron transport chain?
are located in the inner mitochondrial membrane - ANSWER -No, no ATP is produced in the
from the mitochondrial matrix. electron transport chain
Explain why energy is required to move the hydrogen Is any ATP used in the electron transport chain? -
ions across the membrane in the direction indicated ANSWER -No, no ATP is used in the electron
in Model 1. - ANSWER -Energy is required to transport chain
move the hydrogen ions across the membrane in the
direction indicated in Model 1 because the hydrogen
ions are moving against the concentration gradient Describe the movement of hydrogen ions through the
by active transport which needs energy to work. membrane illustrated in Model 2. - ANSWER -
Hydrogen ions diffuse from the intermembrane space
(in between outer and inner mitochondrial
Where do the electron acceptor molecules (for membranes), where there is a relatively higher
oxidative phosphorylation) come from? - concentration of H+ ions, through the ATP synthase
ANSWER -The electron acceptor molecules protein, to the mitochondrial matrix, where there is a
come from glycolysis, the link reaction, and krebs relatively lower concentration of H+ ions.
cycle.
Would free energy be required for the hydrogen ions
When the electrons are released from the electron to move in the direction shown in Model 2? Explain
acceptor molecules (in oxidative phosphorylation), your reasoning. - ANSWER -Free energy would
what else is produced? - ANSWER -When the not be required for the hydrogen ions to move in the
electrons are released from the electron acceptor direction shown in Model 2 because the hydrogen
molecules H+ ions are also produced. ions are moving through the process of facilitated
diffusion (not moving against concentration gradient)
because the ions are moving down the concentration
Is the release of an electron from one of these gradient through an embedded protein.
electron acceptor molecules oxidation or reduction? -
ANSWER -The release of an electron from one
of these electron acceptor molecules is oxidation, What is the name of the embedded protein that
because there is a decrease in charge provides a channel for the hydrogen ions to pass
through the membrane? - ANSWER -ATP
synthase is the embedded protein that provides a
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Answers Rated A
Describe the region in Model 1 where the highest What molecule is the final electron acceptor after the
concentration of hydrogen ion (H+) is located. - electron has moved through the electron transport
ANSWER -The region in Model 1 where the chain? - ANSWER -Oxygen acts as the final
hydrogen ion concentration is located is the electron acceptor and accepts the electron after it has
intermembrane space which is in between the outer moved through the electron transport chain
mitochondrial membrane and the inner mitochondrial
membrane.
What compound is formed as a final product of the
electron transport chain? - ANSWER -2 water
According to Model 1, how do the hydrogen ions molecules are formed as the final product of the
reach this area (inter membrane space)? - electron transport chain.
ANSWER -According to Model 1, hydrogen
ions reach this area through embedded protein
channels (powered by electron transport chains) that Is any ATP produced in the electron transport chain?
are located in the inner mitochondrial membrane - ANSWER -No, no ATP is produced in the
from the mitochondrial matrix. electron transport chain
Explain why energy is required to move the hydrogen Is any ATP used in the electron transport chain? -
ions across the membrane in the direction indicated ANSWER -No, no ATP is used in the electron
in Model 1. - ANSWER -Energy is required to transport chain
move the hydrogen ions across the membrane in the
direction indicated in Model 1 because the hydrogen
ions are moving against the concentration gradient Describe the movement of hydrogen ions through the
by active transport which needs energy to work. membrane illustrated in Model 2. - ANSWER -
Hydrogen ions diffuse from the intermembrane space
(in between outer and inner mitochondrial
Where do the electron acceptor molecules (for membranes), where there is a relatively higher
oxidative phosphorylation) come from? - concentration of H+ ions, through the ATP synthase
ANSWER -The electron acceptor molecules protein, to the mitochondrial matrix, where there is a
come from glycolysis, the link reaction, and krebs relatively lower concentration of H+ ions.
cycle.
Would free energy be required for the hydrogen ions
When the electrons are released from the electron to move in the direction shown in Model 2? Explain
acceptor molecules (in oxidative phosphorylation), your reasoning. - ANSWER -Free energy would
what else is produced? - ANSWER -When the not be required for the hydrogen ions to move in the
electrons are released from the electron acceptor direction shown in Model 2 because the hydrogen
molecules H+ ions are also produced. ions are moving through the process of facilitated
diffusion (not moving against concentration gradient)
because the ions are moving down the concentration
Is the release of an electron from one of these gradient through an embedded protein.
electron acceptor molecules oxidation or reduction? -
ANSWER -The release of an electron from one
of these electron acceptor molecules is oxidation, What is the name of the embedded protein that
because there is a decrease in charge provides a channel for the hydrogen ions to pass
through the membrane? - ANSWER -ATP
synthase is the embedded protein that provides a
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