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
competitive inhibition of an enzyme
uncompetitive inhibition of an enzyme

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Transcription and Regulation
Most transcripts of protein coding genes are cleaved

at the 5' end immediately before a poly adenylation signal
at the 3' end just after a poly adenylation signal
at the 5' end immediately after a poly adenylation signal
at the 3' end just before a poly adenylation signal

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