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What is the term “Km”?

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What is the term “Km”?

(a) Concentration of the enzyme

(b) Concentration of the catalyst

(c) Concentration of the product

(d) Concentration of the substrate

I had been asked this question in final exam.

Enquiry is from Determining Enzyme Kinetic Constants from Batch Data in section Homogenous Reactions of Bioprocess Engineering

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Best answer
Right option is (d) Concentration of the substrate

Best explanation: For practical purposes, Km is the concentration of substrate which permits the enzyme to achieve half vmax. An enzyme with a high Km has a low affinity for its substrate, and requires a greater concentration of substrate to achieve vmax.

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