What is the consequence of RNAP being bound to the operon promoter?

When RNA polymerase (RNAP) is bound to the operon promoter, it initiates the process of transcription, which is the first step in gene expression. The binding of RNAP to the promoter region signifies that the genes within the operon are being read and transcribed into messenger RNA (mRNA). As a result, the expression of the genes within the operon is activated, allowing for the production of the corresponding proteins.

In the context of operons, particularly in prokaryotic organisms like bacteria, the binding of RNAP to the promoter is crucial for the coordinated expression of multiple related genes that are often involved in a common metabolic pathway or function. This process ultimately leads to a functional response in the cell, as the proteins produced can carry out specific tasks that are essential for the organism's survival or adaptation to environmental changes.

This overall activation of gene expression highlights the importance of RNAP binding to the operon promoter in regulating the intricate network of cellular functions, making the correct answer focused on activation.