OXIDATIVE PHOSPHORYLATION
UPDATED Exam Questions and
CORRECT Answers
Describe the region in Model 1 where the highest concentration of hydrogen ion (H+) is located.
- CORRECT ANSWER - The region in Model 1 where the hydrogen ion concentration is
located is the intermembrane space which is in between the outer mitochondrial membrane and
the inner mitochondrial membrane.
According to Model 1, how do the hydrogen ions reach this area (inter membrane space)? -
CORRECT ANSWER - According to Model 1, hydrogen ions reach this area through
embedded protein channels (powered by electron transport chains) that are located in the inner
mitochondrial membrane from the mitochondrial matrix.
Explain why energy is required to move the hydrogen ions across the membrane in the direction
indicated in Model 1. - CORRECT ANSWER - Energy is required to move the hydrogen
ions across the membrane in the direction indicated in Model 1 because the hydrogen ions are
moving against the concentration gradient by active transport which needs energy to work.
Where do the electron acceptor molecules (for oxidative phosphorylation) come from? -
CORRECT ANSWER - The electron acceptor molecules come from glycolysis, the link
reaction, and krebs cycle.
When the electrons are released from the electron acceptor molecules (in oxidative
phosphorylation), what else is produced? - CORRECT ANSWER - When the electrons are
released from the electron acceptor molecules H+ ions are also produced.
Is the release of an electron from one of these electron acceptor molecules oxidation or
reduction? - CORRECT ANSWER - The release of an electron from one of these electron
acceptor molecules is oxidation, because there is a decrease in charge
UPDATED Exam Questions and
CORRECT Answers
Describe the region in Model 1 where the highest concentration of hydrogen ion (H+) is located.
- CORRECT ANSWER - The region in Model 1 where the hydrogen ion concentration is
located is the intermembrane space which is in between the outer mitochondrial membrane and
the inner mitochondrial membrane.
According to Model 1, how do the hydrogen ions reach this area (inter membrane space)? -
CORRECT ANSWER - According to Model 1, hydrogen ions reach this area through
embedded protein channels (powered by electron transport chains) that are located in the inner
mitochondrial membrane from the mitochondrial matrix.
Explain why energy is required to move the hydrogen ions across the membrane in the direction
indicated in Model 1. - CORRECT ANSWER - Energy is required to move the hydrogen
ions across the membrane in the direction indicated in Model 1 because the hydrogen ions are
moving against the concentration gradient by active transport which needs energy to work.
Where do the electron acceptor molecules (for oxidative phosphorylation) come from? -
CORRECT ANSWER - The electron acceptor molecules come from glycolysis, the link
reaction, and krebs cycle.
When the electrons are released from the electron acceptor molecules (in oxidative
phosphorylation), what else is produced? - CORRECT ANSWER - When the electrons are
released from the electron acceptor molecules H+ ions are also produced.
Is the release of an electron from one of these electron acceptor molecules oxidation or
reduction? - CORRECT ANSWER - The release of an electron from one of these electron
acceptor molecules is oxidation, because there is a decrease in charge
