Problem :
What two molecules are oxidized in the electron transport chain?
NADH and FADH are oxidized in the electron transport chain.
Problem :
How is oxidation linked to electron transport?
An oxidation reaction involves the loss of electrons. When NADH and FADH are
oxidized, they lose electrons. These electrons flow into the electron transport
chain once they are released from NADH and FADH.
Problem :
What is the destination of the electrons that flow through the electron
transport chain?
The electrons in the electron transport chain ultimately flow to a molecule of
oxygen, thereby reducing it to water.
Problem :
What reaction of the citric acid cycle produces the FADH that is oxidized by
complex II of the electron transport chain?
The reaction catalyzed by the enzyme succinate dehydrogenase,
which converts
succinate to fumarate produces a molecule of FADH.
Problem :
Describe the nature of the electrochemical gradient established across
the mitochondrial inner membrane as a result of electron transport.
As a result of electron transport, protons are pumped across the inner
mitochondrial membrane out of the matrix into the intermembrane space. Because
so many positive protons are pumped into the intermembrane space and the flow of
electrons in inner membrane, a net positive charge is built up in the
intermembrane space. A net negative charge is also built up in the matrix
space.
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