Why would glucose (anaerobically) respire faster than fructose in yeast?

Question

According to this image, http://www.elmhurst.edu/~chm/vchembook/images/601glycolysisblue.gif fructose need less steps to get to pyruvate in glycolysis.

Many thanks.

Answer 1

This is because of the difference in the chemical structures of glucose and fructose. If you look through the individual steps of anaerobic respiration, you will see that after fructose is introduced, it becomes fructose-6 phosphate, but after glucose is introduced, 2 steps are required to convert glucose into the same product that would take fructose only one step.