<prompt> Which of the follow ing is not a rate-limiting enzyme-HMG CoA reductasePhosphofructokinaseAcetyl CoA carboxylaseMalonate dehydrogenase  <response>: Ans. is d i.e., Malonate dehydrogenase o Malonate dehydrogenase is not a rate-limiting enzymes. o HMG-CoA reductase in cholesterol synthesis, phosphofructokinase I in glycolysis and acetyl-CoA carboxylase in fatty acid synthesis are rate-limiting enzymes, Reactions Rate-limiting enzymes Glycolysis Phosphofructokinase Glycogen synthesis Glycogen synthetase Glycogenolysis Glycogen phosphorylase TCA cycle Isocitrate dehydrogenase Fatty- acid synthesis Acetyl CoA carboxylase Cholesterol synthesis HMG CoA reductase Ketone body synthesis HMG CoA synthase Bile acid synthesis 7-oc-hydroxylase Catecholamine synthesis Tyrosine hydroxylase Urea synthesis CPS - I 