Q.
The number of decarboxylations that occur in one turn of citric acid cycle is:
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a
Two
b
Three
c
Four
d
Six
answer is A.
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Detailed Solution
In Krebs cycle there is two successive steps of decarboxylation, leading to the formation of α-ketoglutaric acid and then succinyl-CoA. The conversions are as followsIsocitrate (6C) →α-ketoglutarate (5C) + CO2α-ketoglutarate (5C) → Succinyl CoA(4C) + CO2
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