to produce 'native' monomers of yeast enolase

Phosphoenolpyruvate (PEP)

Yes, Mg2+ is a cofactor for the enzymes phosphofructo kinase-1, phosphoglycerate kinase, enolase, and pyruvate kinase in glycolysis.

decreases blood glucose, as fluoride inhibits enolase enzyme in glycolysis, and there is an accumulation of phosphenolpyruvate and no pyruvate being produced, thus no energy.

this is shamefully vague question.

In glycolysis, glucose and (hexokinase, phosphogluco-mutase, aldolase, triose-phosphate isomerase, glyceraldehyde-phosphate dehydrogenase, phosphoglycerate-kinase, phosphoglycerate mutase, enolase and pyruvate kinase) enzymes are used.