Protein X Is Found to Bind to a Certain Gene's

Protein X is found to bind to a certain gene's promoter only when substance A is not present.The gene can be transcribed in the presence of both X and A.It is not transcribed in the presence of X alone.Protein X is a(n) ________.Substance A is a(n) ________.

A) repressor;inducer
B) repressor;corepressor
C) activator;inducer
D) activator;corepressor

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