NTA Abhyas NEET2020ChemistryBiomoleculesPractice
The Km of an enzyme is
Options
- AOne half of the Vmax
- BA dissociation constant
- CThe substrate concentration that gives maximal velocity
- DThe substrate concentration that gives half maximal velocity
Correct answer
D. The substrate concentration that gives half maximal velocity
Step-by-step solution
This value is numerically equal to the substrate concentration at which half of the enzyme molecules are associated with the substrate. Km value is an index of the affinity of the enzyme for its particular substrate. This is usually expressed as the Km (Michaelis constant) of the enzyme, an inverse measure of affinity.