Which of the Following Enzymes is Used by the Gluconeogenic

Question

Which of the following enzymes is used by the gluconeogenic pathway but not the glycolytic pathway?
A)pyruvate kinase
B)phosphoenolpyruvate carboxykinase
C)glyceraldehyde-3-phosphate dehydrogenase
D)triose phosphate isomerase
E)hexokinase

Accepted Answer

Phosphoenolpyruvate carboxykinase is an enzyme used exclusively by the gluconeogenic pathway to convert oxaloacetate to phosphoenolpyruvate, while pyruvate kinase is used exclusively by the glycolytic pathway to convert phosphoenolpyruvate to pyruvate. Glyceraldehyde-3-phosphate dehydrogenase and triose phosphate isomerase are used by both pathways, while hexokinase is used by the glycolytic pathway to convert glucose to glucose-6-phosphate.