A bacterial gene (gene A) ordinarily makes a protein that binds to DNA.A mutation of gene A decreases the expression of another gene, gene B.We can conclude that

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Quizplus · Accepted Answer

Since the mutation in gene A, which normally produces a protein that binds to DNA, results in decreased expression of gene B, it implies that the normal function of gene A's product is to enhance or enable the expression of gene B. Therefore, gene A acts as a positive regulator of gene B.

A Bacterial Gene (Gene A) Ordinarily Makes a Protein That