Which statements about the Michaelis–Menten constant (Km) of an enzyme are correct?
1. At the Km value, half the active sites of the enzyme should be occupied by the substrate.
2. Km represents the substrate concentration at which the enzyme is working at half its maximum rate.
3. The lower the Km value, the lower the affinity of the enzyme to its substrate.
4. When an enzyme has a high Km value, the enzyme-catalysed reaction will proceed very slowly to its maximum rate.
1 )
1, 2 and 3
1, 2 and 4
3 )
1 and 3 only
4 )
2 and 4 only
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