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:

A: gene A is a positive regulator of gene B.
B: gene A is a negative regulator of gene B.
C: gene B is a positive regulator of gene A.
D: gene B is a negative regulator of gene A.
E: genes A and B regulate one another.


Ans: A: gene A is a positive regulator of gene B.

Biology & Microbiology

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