The lactose analog isopropyl-beta-D-thio-galactoside (IPTG) is often used to regulate gene expression systems in bacteria. IPTG does not act as a substrate for beta-galactosidase, but can bind to, and inactivate, the repressor. In this case, IPTG serves as a(n)

A. DNA-binding protein.
B. inducer.
C. operon.
D. repressor.


Answer: B

Biology & Microbiology

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