Chapter 16.1, Problem 2R

Summary Introduction

To review:

The comparison of molecular conditions that occur at the lac operon promoter in the absence as well as the presence of lactose.

Introduction:

The operon is generally a cluster of genes containing a single promoter. The operon found in Escherichia coli which encodes three lactose metabolizing enzymes is known as lac operon. Along with promoter lac operon also has an operator, repressor, and regulatory sequences. In the presence of lactose, the enzyme ribonucleic acid (RNA) polymerase attaches to the promoter and initiate transcription. In the absence of lactose, the repressor mainly binds to the promoter and blocks the process.