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.

the correct answer is sex-linked recessive.

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before, trains worked using the steam engine. thus, it uses heat so it is crucial to apply heat balance. the steam engine absorbs energy during the stage of boiling water. so, this is the endothermic reaction. when the steam is used to work the piston, it has to release this energy through running the train. the excess energy is released as an exhaust to the chimney. this is the exothermic process because it releases energy to the surroundings.