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Biomolecules — Chemistry STD 12 Science — Question

Bihar BoardEnglish MediumSTD 12 ScienceChemistryBiomolecules1 Mark
MCQ
Km​ of enzyme is:
  • A
    The substrate concentration at 1/2 of maximum velocity of enzyme action.
  • B
    The substrate concentration at maximum velocity of enzyme action.
  • C
    Half of maximum velocity of enzyme at unit substrate concentration at infinite velocity of enzyme action.
  • D
    Substrate concentration at infinite velocity of enzyme action.
✓

Answer

  1. The substrate concentration at 1/2 of maximum velocity of enzyme action.

Explanation:

The Michaelis Menten constant is the substrate concentration at which the reaction rate is one half the maximum. 

The Km​ describes the affinity of enzyme for a substrate molecule.

Greater the affinity lower is the Km​ value and sooner the Vmax​ can be attained and vice versa.

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