<prompt> All are examples of competitive enzyme blockage exceptCyclooxygenase by AspirinThymidylate synthase by 5-FUCoagulation by DicumarolDHFR by Methotrexate  <response>: Kinetics of enzyme inhibition Competitive inhibitionNon competitive inhibitionKm Increased No change V max No change Decreased Significance Drug action Toxicological Refer: Harpers Illustrated Biochemistry, 26th edition, pg no: 67-68 