As shown in the image, a series of enzymes catalyze the reaction that changes Molecule A into Molecule C. Molecule C, functions as a corepressor for the operon controlling production of Enzyme A when it binds with Molecule D. If no Molecule D is present, which of the following is the most likely result of the presence of large amounts of Molecule C?

Concentration of Enzyme A will decrease.

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Concentration of Enzyme A will increase.

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Concentration of Molecule A will increase.

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Concentration of Enzyme B will decrease.

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Solution

The correct option is B Concentration of Enzyme A will increase.
In the absence of molecule D the concentration of molecule C will increase, but it cannot bind to enzyme A as both molecules C and D are to be present to suppress the activity of enzyme A. So, as the concentration of molecule A increases the concentration of the enzyme A will increase and so will the concentration molecule C.
So, the correct answer is ' Concentration of Enzyme A will increase.'

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	Item I		Item II
(A)	Allosteric effect	(P)	Molecule binding to the active site of enzyme
(B)	Competitive inhibitor	(Q)	Molecule crucial for communication in the body
(C)	Receptor	(R)	Molecule binding to a site other than the active site of enzyme
(D)	Poison	(S)	Molecule binding to the enzyme covalently

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