As shown in the image, a series of enzymes catalyze the reaction that changes Molecule A into Molecule C. Presence of Molecule C competitively inhibits the actions of Enzyme A. Which of the following is the most likely result of the presence of large amounts of Molecule C?

The concentration of Enzyme A will decrease.

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The concentration of Molecule A will decrease.

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The concentration of Molecule B will decrease.

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The concentration of Enzyme B will decrease.

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Solution

The correct option is C The concentration of Molecule B will decrease.
In the given operon, there are two enzymes which convert molecule A into molecule C. Molecule C acts as a competitive inhibitor for the enzyme A, which is required for the conversion of molecule A to molecule B. If large amount of molecule C are introduced in the given reaction, then it will act as competitive inhibitor and would bind to molecule A instead of enzyme A binding to it. This will in turn decrease the concentration of molecule B followed by molecule C. However, it will not affect the concentration of enzyme B or molecule A.
Thus, the correct answer is 'The concentration of Molecule B will decrease.'

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