for which enzyme does thiamine(vB1)/biotin(vB3) serves as a cofactor?

vB1
①α-ketoglutarate dehydrogenase
②Transketolase
(thiamine deficiency can be diagnosed if ☆baseline erythrocyte transketolase activity is low but increase after addition of thimine pyrophosphate)(HMP shunt→glycolysis/gluconeogenesis)
③Pyruvate dehydrogenase (to acetyl CoA)

vB3
①pyruvate carboxylase (to oxaloacetate)
②malonyl CoA carboxylase
③propionyl CoA carboxylase

biochemistry UWorld