Biology

The correct answer is: B.Transcription of a desired mRNA sequence

Explanation:

In many signal transduction pathways, the final response often involves changes in gene expression. This typically includes transcription of a desired mRNA sequence that will be translated into proteins required for the cell's response to the signal.

Here's a breakdown of the other options:

A.Activation of a G-protein receptor: This is an early step in some signaling pathways, not the final response. The G-protein receptor is usu...