Question: In the Cori cycle, when glucose is degraded by glycolysis to lactate in muscle, the lactate is excreted into the blood and returns to the liver where it is converted back into glucose by gluconeogenesis.

Sort the following list of enzymes into those that are involved in:
•Both glycolysis (including lactate formation) and gluconeogenesis
•Glycolysis of glucose to lactate only
•Gluconeogenesis only
•Neither pathway

Enzymes:
1. Adolase
2. Pyruvate Carboxylase
3. Phosphoglycerate Kinase
4. Glucose 6-phosphate dehydrogenase
5. Hexokinase
6. Fumarase
7. Pyruvate Kinase
8. Phosphoenolpyruvate Carboxykinase