Chapter 18, Problem 13PIAT

Summary Introduction

To review:

The gene regulatory circuit accounts for bacteria emitting light only when they reach a high cell density.

Introduction:

The light-producing genes are organized and operate under positive control. In molecular biology, positive regulation implies that a transcription factor is required to bind at the promoter site in gene to enhance RNA polymerase to initiate transcription. The activator that functions in this operon is LuxR. This activator is responsible for the emission of the light.