This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Biochemistry
The conversion of glucose 6-phosphate to fructose 6 phosphate is an example of which of the following reaction? 
Select and explain. 
A. Phosphate transfer, B. Isomerization, C. Dehydration, D. Aldol cleavage
B: Isomerization
Answer: B: Isomerization 
Explanation: The conversion of glucose 6 -phosphate to fructose 6- phosphate is an example of isomerization reactions catalysed by isomerase enzyme.These enzymes can produce optical,geometric or positional isomers of substrates. Ref: Janson L.W., Tischler M.E. (2012). Chapter 2. Carbohydrates. In L.W. Janson, M.E. Tischler (Eds), The Big Picture: Medical Biochemistry.