This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Enzymes, Subject name: Biochemistry
In non-competitive enzyme action: 
Select and explain. 
A. Vmaxis increased, B. Apparent km is increased, C. Apparent km is unchanged, D. Concentration of active enzyme moleculeis reduced.
C: Apparent km is unchanged
Answer: C: Apparent km is unchanged 
Explanation: Ans. C. Apparent km is unchangedNon-Competitive inhibition- The inhibitor and the substrate binds at different sites on the enzyme. It can bind either free enzyme or the ES complex, thereby preventing the reaction from occurring.In this inhibition Km value is Unchanged and Vmax decreases.