<prompt> Fluoride which is used in the collection of blood samples for glucose estimation inhibits whch of the following enzyme?GlucokinaseHexokinaseEnolaseGlucose-6-phosphatase  <response>: For blood glucose estimation in the laboratory, fluoride is added to the blood to prevent glycolysis by cells by inhibiting enzyme enolase so that blood glucose is correctly estimated. Ref: Harpers Principles of Internal Medicine, 26th Edition, Page 137; Textbook of Biochemistry By Vasudevan, 5th Edition, Pages 58, 87 