An isomerase converts glucose-6-phosphate into which molecule during the second step of glycolysis?
AFructose-6-phosphate
BFructose-1,6-bisphosphate
CGlyceraldehyde-3-phosphate
DPhosphoenolpyruvate
Answer & Solution
Correct answer: A. Fructose-6-phosphate
1. An isomerase converts a molecule into one of its isomers.
2. In step two, glucose-6-phosphate is converted into its isomer fructose-6-phosphate.
3. This change from phosphoglucose to phosphofructose is what allows the later even split into two three-carbon molecules.
4. Fructose-1,6-bisphosphate comes one step later, after a second phosphate is added.
_Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 7 "Cellular Respiration", section 7.2 Glycolysis_
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