Question

Analyze the diagram below:

According to the model represented in the diagram, which of the following would cause the cell to not express the lacZ, lacY, and lacA sequences?


Binding the RNA polymerase to the gene

Preventing the repressor from binding to the lac operon

Removing the inducer

Transcribing the lacl sequence

Answer 1

Answer: removing the inducer

Explanation: all sequences need an inducer present in order for them to be expressed

Answer 2

Transcribing the lacl sequence

Step-by-step explanation:

lacZ, lacY, and lacA sequences are the structural genes, which needs to be expressed in order to produce their proteinous enzymes required for the breaking down of lactose sugar. The transcription of these three genes must occur with the aid of RNA polymerase binding to them.

However, a gene sequence called lacI encodes information for an repressor, which when expressed can inhibit the expression of the genes lacZ, lacY, and lacA. Hence, the TRANSCRIPTION OF THE LACL SEQUENCE cause the cell to not express the lacZ, lacY, and lacA sequences.