This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Enzyme Specificity and Allosteric Regulation, Subject name: Biochemistry
Biotin is a Co-enzyme for - 
Select and explain. 
A. Transketolase, B. Dehydrogenase, C. Oxidase, D. Carboxylase
D: Carboxylase
Answer: D: Carboxylase 
Explanation: Ans. is 'd' i.e., Carboxylase VitaminActive form (coenzymes)Reaction typeB1 (Thiamin)Thiamine pyrophosphate (TPP)Oxidative decarboxylation, TransketolationB2 (Riboflavin)FMN, FADOxidation / Reduction (Redox reaction)B3 (Niacin)NAD+, NADP+Oxidation / Reduction (Redox reaction)B6 (Pyridoxin)Pyridoxal phosphate (PLP)Transamination, deamination, decarboxylation, condensation, trans-sulfurationB12 (cobolamin)Methylcobalamin. deoxyadenosy Icoba lam inIsomerization of meihylmelonyl-CoA to succinyl-CoA, synthesis of methionine from homocysteineFolic acidTetrahydrofolate (THF)One carbon group transferBiotinBiocytinCarboxylationPantothenic acidPentothenate in Co A and ACPAcyl group transferVitamin KVitamin KCarboxylation of glutamic acid residue