Question

If your lac operon looked like the image below, which of the following can you infer?

You had cereal and milk for breakfast.
Your lac operon is expressed.
You have not consumed lactose from dairy recently,
None of the above.

Answer 1

Answer:

You have not consumed lactose from dairy recently

Explanation:

According to the diagram, there is a represssor element in the regulatory region of the operon. This repressor is blocking the RNA polymerase, that is bound to its promoter region upstream of the genes, from transcription. The repressor is mostly the lac repressor that switches of the operon in the absence of lactose.