As shown in the image, a series of enzymes catalyze the conversion of Molecule A to Molecule C. Molecule C functions as a corepressor for the operon controlling production of Enzyme A.
Which of the following scenarios would most likely result from the introduction of a large amount of Molecule C?

Concentration of Enzyme A will decrease.

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Concentration of Molecule A will decrease.

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Concentration of Molecule B will increase.

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Concentration of Enzyme B will increase.

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Solution

The correct option is A Concentration of Enzyme A will decrease.
In the given operon, there are two enzymes which convert molecule A into molecule C. Molecule C acts as a corepressor molecule which controls the production of 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 corepressor and would decrease the concentration of enzyme A. 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 'Concentration of Enzyme A will decrease.'

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