Which regulatory sequences are bound by activator proteins and associated coactivator proteins to form a protein "bridge" that bends the dna and links the complete initiation complex at the promoter to the activator-coactivator complex, ultimately causing an increase in transcription?

The answer is the Enhancer

Explanation:

Because Enhancer sequences bind specific proteins that interact with the proteins bound at gene promoters, and together promoters and enhancers drive transcription of certain genes.

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