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Citric Acid Cycle
EXAM 2
24
Medical
Professional
08/28/2010

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Cards

Term
how is pyruvate converted to alanine?
Definition
transamination
Term
how is pyruvate converted to oxaloacetate?
Definition
carboxylation
Term
how is pyruvate converted to acetyl CoA?
Definition
oxidative decarboxylation
Term
how is pyruvate converted to lactate?
Definition
reduction
Term
what is acetyl coA the common product of
Definition
carbohydrate, amino acid, and FA breakdown
Term
The majority of regulatory mechanisms target this part of the PDC complex.
Definition
E1, the actual pyruvate dehydrogenase enzyme.
Term
one acetyl group is oxidized to form what
Definition
2 CO2
Term
how many NADH and FADH2
Definition
3 and 1
Term
How many GTP are produced
Definition
1
Term
Where do the abstracted electron pairs go after the tca cycle?
Definition
electron transport chain
Term
how many ATPs are produced in a turn of the Citric acid cycle
Definition
12 ATP
Term
Fluoroacetate inhibits what in the citric acid cycle?
Definition
stops the aconitase enzyme b/t citrate and cis-aconitase. this leads to a build up of citrate which deprives the cell of energy.
Term
how does malonate affect the TCA cycle?
Definition
it binds to the active site of succinate dehydrogenase and does not act.

it is a competitive inhibitor with succinate
Term
what is the effect of arsenite on the TCA?
Definition
arsenite covalently binds to sulfhydryl groups and inactivates the PDC and a-ketoglutarate dehydrogenase.
Term
what reaction replenishes intermediates of the TCA cycle?
Definition
anaplerotic reactions
Term
in the anaplerotic reactions, what is pyruvate replenished with?
Definition
AA's
Term
oxaloacetate is replaced with what in anaplerotic pway
Definition
aspartate
Term
fumarate is replenished with what
Definition
AA.
Term
what is FAD a cofactor in?
Definition
pyruvate and a-ketoglutarate
Term
NAD+ is coenzyme for?
Definition
three dehydrogenases in cycle and PDC
Term
What is pantothenic acid
Definition
a component of CoA
Term
what biotin involved in?
Definition
carboxylation reactions (pyruvate carboxylase)
Term
what is thiamine pyrophosphate
Definition
coenzyme for the pyruvate and a-ketoglutarate dehydrogenase reactions
Term
What can thymine deficiency lead to?
Definition
loss of appetite, constipation, and nausea which leads to depression and peripheral neuropathy. also alcholic syndrome.

can also lead to beri beri
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