Final answer:
The steps from lactate to PEPS28 involve several biochemical processes including glycolysis and metabolic conversions.
Step-by-step explanation:
The steps from lactate to PEPS28 involve several biochemical processes. First, lactate undergoes a series of steps in glycolysis to produce 2-phosphoglycerate. This is followed by the conversion of 2-phosphoglycerate to phosphoenolpyruvate (PEP) by the enzyme enolase. During this conversion, H₂O, potassium, and magnesium are released. Finally, phosphoenolpyruvate is further metabolized to form PEPS28 through additional metabolic pathways.