Exam (elaborations)
ADVANCED BIOCHEMISTRY EXAM 2 QUESTIONS AND CORRECT ANSWERS
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ADVANCED BIOCHEMISTRY EXAM 2 QUESTIONS AND CORRECT ANSWERS...
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Molecules involved in the conversion of oxidized proteins to their functionalreduced sulfhydryl form include all of the following EXCEPT?
catalase
-
All of the following are components of the electron transport chain EXCEPT?
coenzyme A
-
The ETC component that transfers electrons directly to oxygen is what?
cytochrome oxidase
-
During the oxidation of NADH, there are several steps in which delta E naught
prime is sufficient for ATP synthesis. These occur within what?
Complexes I, III, and IV
-
Which of the following molecules inhibits Complex I of the electron transport
chain?
Amytal
-
ATP synthesis and mitochondrial electron transport are coupled by what?
Proton-motive force and proton gradient
-
,Evidence supporting the chemiosmotic theory includes all of the following
EXCEPT?
The pH of a weakly buffered suspension of mitochondria rises when O2 is
added.
-
Examples of uncouplers include what?
Both DNP and gramicidin
-
In the ATP synthase, the F0 factor [blank]?
Has three types of subunits and is a transmembrane proton channel.
-
The maximum P/O ratio of FADH2 is what?
1.5
-
The control of aerobic respiration by what substance is referred to as respiratory
control?
ADP
-
The first ROS formed during the reduction of oxygen is what?
superoxide radical
-
The reaction of iron with hydrogen peroxide results in the production of what?
Both a hydroxyl radical and a hydroxide ion
-
ROS are generated during which of the following processes?
All of the above are correct.
, -
What does glutathione peroxidase do?
Both converts organic peroxides into alcohols and reduces H2O2 into H2O.
The NADPH required for the generation of GSH from GSSG is synthesized by
the reactions of what?
The pentose phosphate pathway
-
Glutathione peroxidase requires what cofactor for full activity?
Selenium
-
Examples of antioxidants include all of the following EXCEPT what?
gramicidin
-
One of the mechanisms by which vitamin C protects membrane is by what?
Both regenerating reduced alpha-tocopherol and reacting with peroxyl radicals.
-
The ultimate electron acceptor of the mitochondrial electron transport system is
what?
O2
-
The major sources of NADH that reduce Complex I of the ETC include what?
Both fatty acid oxidation and the citric acid cycle.
-
In Complex III, electrons are transferred from UQH2 to what?
cytochrome c
-
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