Lac Operon and Pseudo-Operators

Contribute to repression by binding LacI more weakly (correct)

Prevent the binding of LacI to LacO

Act as an alternative operator for LacI binding

Enhance gene expression by binding LacI more strongly

One LacI tetramer could bind two separate operators and generate a looped DNA structure (correct)

It promotes the transcription of the lac operon

It prevents the binding of LacI to LacO

It allows for the simultaneous binding of multiple repressor proteins

Evidence obtained from a variety of laboratories (correct)

Observation of enhanced gene expression in lac operon mutants

The presence of additional regulatory elements in the lac operon

The absence of pseudo-operators in mutant lac operons