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Multiple Choice
According to the chart below, which one of the following enzymes has the strongest affinity for its substrate?
A
Lysozyme.
B
Penicillinase.
C
β-Galactosidase.
D
Chymotrypsin.
E
Carbonic anhydrase.
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Verified step by step guidance
1
Understand that enzyme affinity for its substrate is often measured by the Michaelis constant (Km). A lower Km value indicates a higher affinity, as it means the enzyme can achieve half-maximal catalytic activity at a lower substrate concentration.
Examine the chart provided, which lists several enzymes along with their substrates and corresponding Km values in micromolar (μM).
Identify the Km values for each enzyme: Lysozyme (6 μM), Penicillinase (50 μM), β-Galactosidase (4000 μM), Chymotrypsin (5000 μM), and Carbonic anhydrase (8000 μM).
Compare the Km values to determine which enzyme has the lowest Km value, as this indicates the strongest affinity for its substrate.
Conclude that the enzyme with the lowest Km value, and therefore the strongest affinity for its substrate, is Lysozyme with a Km of 6 μM.