Protein X is found to bind to a certain geneʹs 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/an . Substance A is a/an .
A) repressor; inducer
B) repressor; corepressor
C) activator; inducer
D) activator; corepressor

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The Answer of Protein X is found to bind to a certain geneʹs 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/an . Substance A is a/an .
A) repressor; inducer
B) repressor; corepressor
C) activator; inducer
D) activator; corepressor

Protein X Is Found to Bind to a Certain Geneʹs