Which one of the following about enzymes is true?
Correct Answer: Low Km-High affinity
Description: (Refer: DM Vasudevan, Textbook of Biochemistry, 7th edition, pg no: 59 - 60)
The Michaelis constant (km)
Km provides a measure of the affinity of the enzyme for its substrate.
It is equal to substrate concentration at which reaction velocity is equal to ½ Vmax.
Km = substrate concentration when reaction velocity is % Vmax.
Km is constant for any given enzyme.
Km is independent of substrate or enzyme concentration.
The higher is KM, the higher is the concentration of the substrate required to reach ½ Vmax.
That is: at a lower affinity, a higher concentration of substrate is required to reach ½ Vmax.
↓ Km = ↑ affinity.
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