Isopropyl β-D-1- Thiogalactopyranoside (IPTG),a Lactose Analog,acts as an Inducer of the Lac

question 15

Multiple Choice

Isopropyl β-d-1- thiogalactopyranoside (IPTG) ,a lactose analog,acts as an inducer of the lac operon.What is its mode of action?

• A)It functions as a co-activator of gene expression.
• B)It inactivates the LacI repressor protein.
• C)It activates the enzyme β-galactosidase.
• D)It binds the RNAP for enhanced binding to the promoter.
• E)It binds to the operator to enhance transcription initiation.

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