Chapter 19, Problem 6CONQ

Summary Introduction

To review:

The terms that can be used to describe the second mutation in the lacY gene in the lac operonout of the following:

Reversion

Intragenic suppressor

Intergenic suppressor

Missense mutation

Introduction:

The lac operon found in bacterial species consists of three genes, namely, lacZ, lacY and lacA. LacZ codes for an enzyme known as β-galactosidase (cleaves lactose to form galactose and glucose), lacY codes for an enzyme known as lactose permease (allows entry of lactose inside the cell) and lacA codes for an enzyme known astransacetylase (adds chemical groups to other molecules).