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Electron Transport Chain
EXAM 2
36
Medical
Professional
08/28/2010

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Cards

Term
what is the inner membrane of the mitochondria permeable to?
Definition
CO2, H20, H+, ATP
Term
what must be actively transported across the inner membrane?
Definition
NADH
Term
in the malate aspartate shuttle, how many ATP are produced by each NADH
Definition
3
Term
The glycerophosphate shuttle produces how many ATP per NADH
Definition
2
Term
when is the glycerphosphate shuttle used?
Definition
to yield additional ATP for brain and skeletal muscle
Term
what is the chemiosmotic hypothesis?
Definition
pumping H+ to the intermembrane space creates an electrochemical and pH gradient that drives ATP synthesis
Term
for each electron pair, how many H+ are pumped into the inter membrane space
Definition
10
Term
what is standard reduction potential?
Definition
ease with which an electron donor gives up its electrons to an electron acceptor
Term
what is the structure of complex 1
Definition
1 FMN iron sulfur clusters
Term
what is the structure of complex 2
Definition
succinate dehydrogenase, FAD, iron sulfur clusters and cytochrome c
Term
what is the function of coenzyme q?
Definition
shuttles electrons b/t 1/2 and 3
Term
what is the structure of complex 3
Definition
shuttles electrons b/t complexes 3 and 4
Term
what is the structure of complex 4
Definition
cytochrome oxidase c- two a hemes and two Cu containing centers.
Term
how many electrons can FAD OR FMN transfer
Definition
1 or 2
Term
how many protons are pumped from the matirx to the intermembrane space?
Definition
4
Term
which complex does not pump protons into the intermembrane space
Definition
complex 2
Term
how is the heme group cofactor
Definition
the heme iron is reduced and oxidized b/t the Fe2 and Fe3+ during electron transport
Term
how many molecules of oxygen does NAD yield?
Definition
1/2
Term
what drives ATP synthesis by complex V
Definition
electrochemical gradient generated by proton translocation
Term
how many protons do complex 3 pump?
Definition
4
Term
deprotonation of this causes ATP synthase to spin
Definition
deprotonation of c subunit
Term
rotation of this subunit induces conformational changes in the F1 particle binding site resulting in ATP synthesis
Definition
Term
what is the function of DNP
Definition
diffuses through membrane and cause electron transport to proceed at a rapid rate w/o establishing a proton gradient. heat is released
Term
what is the name of the uncoupling protein that regulates heat?
Definition
thermogenin
Term
what is the P:O ratio?
Definition
the # of ATPs generated upon electron pair entry at different points
Term
what is the P:O for Complex I?
Definition
3
Term
what is the P:O for cytochrome C?
Definition
1
Term
what can be measured by monitoring oxygen consumption?
Definition
rate of electron transport
Term
What does Rotenone inhibit
Definition
Complex I
Term
how is the rotenone insecticide overturned
Definition
addition of succinate
Term
how is the rotenone insecticide overturned
Definition
addition of succinate
Term
what does antimycin inhibit?
Definition
complex 3
Term
how is antimycin overturned
Definition
ascorbate
Term
how does cyanide and carbon monoxide inhibit complex 4?
Definition
binding to heme a3
Term
can cyanide poisoning be overturned?
Definition
no
Term
can cyanide poisoning be overturned?
Definition
no
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