This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Enzymes, Subject name: Biochemistry
Hexokinase is 
Select and explain. 
A. Ligase, B. Transferase, C. Oxidoreductase, D. Reductase
B: Transferase
Answer: B: Transferase 
Explanation: A hexokinase is an enzyme that phosphorylates hexoses (six-carbon sugars), forming hexose phosphate. In most organisms, glucose is the most impoant substrate of hexokinases, and glucose-6-phosphate is the most impoant product. Hexokinase can transfer an inorganic phosphate group from ATP to a substrate.