<prompt> Answer this question truthfullyWhat type of reactions does Vitamin B7 biotin act as a cofactor for?  <response>: <reason> Vitamin B7 biotin is a water-soluble vitamin that acts as a cofactor for several carboxylation reactions in the body. Carboxylation is the process of adding a carboxyl group COOH to a molecule, and this is an important step in many metabolic pathways. Some examples of carboxylation reactions that require biotin as a cofactor include the metabolism of fatty acids, amino acids, and glucose. Therefore, Vitamin B7 biotin is essential for many important metabolic processes in the body. 