Multiple choice Which of the following enzymes does not obey Km kinetics? Allosteric enzymes Proenzymes Zymogens Exoenzymes Both 1 and 2 Reveal answer Fill a bubble to check yourself A Correct answer Explanation The value of Km (Michaelis-Menten constant) varies from 10-1 to 10-6 M but for allosteric enzymes, there is no constant Km value.