Question

When the lac promoter and lacZ gene are bonded to the DNA strand and and no lactose is present; this will lead to accumulation of lactose and it's byproducts in the cells.

options:
True
False

Answer 1

Answer: true

Explanation: In the absence of lactose the lac repressor blocks the expression of the lac operon by binding to the DNA at a site, called the operator that is downstream of the promoter and upstream of the transcriptional initiation site.