For Many Enzymes, the Rate of Product Formation Increases as the Concentration

question 9

Multiple Choice

For many enzymes, the rate of product formation increases as the concentration of the substrate increases. Eventually the rate of the reaction reaches a maximum at which further increases in the concentration of the substrate have no effect. Why?

• A) The enzyme is no longer specific for the substrate.
• B) At high concentrations of substrate, the reaction is endergonic.
• C) At high concentrations of substrate, the activation energy of the reaction increases.
• D) At high concentrations of substrate, all of the enzyme active sites are being occupied by substrate molecules.
• E) At high concentrations of substrate, the activation energy of the reaction decreases.

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