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

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

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Transcription and Regulation
The major function of RNA polymerase's sigma factor is

recognition of the transcriptional start sequence
recognition of the translational stop sequence
recognition of the translational start sequence
recognition of the transcriptional stop sequence

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