Question

In single Krebs Cycle decarboxylation takes place at ________ steps

• A. Five
• B. Four
• C. Three
• D. Two

Answer 1

Answer: (D)

Two

Answer 2

In Krebs? cycle two decarboxylations occur at following steps:
$\underset{(6 - C)}{\text{Oxalosuccinate}} \ce{->[\text{ Oxalosuccinate}][\text{ decarboxylase}]} \underset{( 5 -C)}{\alpha - \text{ketoglutarate}} + CO_2$
$\underset{(5-C)}{\alpha - \text{ketoglutarate}} + NAD + Co-A \ce{->[\alpha - \text{keto glutarate}][\text{dehydrogenase}]}$
$\underset{(4-C)}{\text{Succinyl }Co- A } + NADH_2 + CO_2$