<prompt> Which of the following glycolytic enzyme does not catalyze irreversible step ?HexokinasePhosphoglycerate kinasePhosphofructokinasePyruvate kinase  <response>: Ans. is b i.e., Phosphoglycerate kinaseIrreversible steps are catalyzed by :- Glucokinase Hexokinase, phosphofructokinase-I, and pyruvate kinase.Reversible steps are catalyzed by :- Phosphohexose isomerase, aldolase, phosphotriose isomerase, glyceraldehyde 3-phosphate dehydrogenase, phosphoglycerate kinase, phosphoglycerate mutase, Enolase. 