0.1 Introduction 10.2 Regulation can be negative or positive 10.3 Structural gene clusters are coordinately controlled 0. 4 The lac genes are controlled by a repressor 10.5 The lac operon can be induced 10.6 Repressor is controlled by a small molecule inducer 10.7 cis-acting constitutive mutations identify the operator 10.8 trans-acting mutations identify the regulator gene 10.9 Multimeric proteins have special genetic properties 10. 10 Repressor protein binds to the operator 10 11 Binding of inducer releases repressor from the operator 10.12 Repressor is a tetramer 0. 13 Repressor binds to three operators and interacts with RNa polymerase 10. 14 Repressor is al ways bound to dna 10. 15 The operator competes with low-affinity sites to bind repressor 10. 16 Repression can occur at multiple loci 消当10.1 Introduction 10.2 Regulation can be negative or positive 10.3 Structural gene clusters are coordinately controlled 10.4 The lac genes are controlled by a repressor 10.5 The lac operon can be induced 10.6 Repressor is controlled by a small molecule inducer 10.7 cis-acting constitutive mutations identify the operator 10.8 trans-acting mutations identify the regulator gene 10.9 Multimeric proteins have special genetic properties 10.10 Repressor protein binds to the operator 10.11 Binding of inducer releases repressor from the operator 10.12 Repressor is a tetramer 10.13 Repressor binds to three operators and interacts with RNA polymerase 10.14 Repressor is always bound to DNA 10.15 The operator competes with low-affinity sites to bind repressor 10.16 Repression can occur at multiple loci