Transcription and Regulation
The binding of lac repressor to DNA could be considered to be analogous to

allosteric effects in enzyme regulation
mixed-type inhibition of an enzyme
uncompetitive inhibition of an enzyme
competitive inhibition of an enzyme

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Transcription and Regulation
The transcriptional regulatory proteins in eukaryotes which induce transcription usually have

at least two distinct domains of protein structure and a DNA binding domain
at least one distinct domains of protein structure, a DNA binding domain and an activation domain
none of these
at least two distinct domains of protein structure, a DNA binding domain and an activation domain

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