MCQ – 89312

The following values are given below:

1. Km of an enzyme = 10 micromole; kcat of the enzyme is 20s-1

2. Km of an enzyme = 200 nanomole; kcat of the enzyme is 50s-1

3. Km of an enzyme = 2 micromole; kcat of the enzyme is 200s-1

4. Km of an enzyme = 4 micromole; kcat of the enzyme is 200s-1

The highest catalytic efficiency is seen in:

Correct Answer � C Explanation

Ans: C

Kcat is directly proportional to activity and Km is inversely proportional to affinity.

Catalytic efficiency is Kcat/Km= 200/2= 100