A new hormone has been isolated from an organism. Although the structure of the hormone has not yet been determined, the hormone is known to exert its effects by forming a hormone-receptor complex that acts as a transcription factor within target cells. What type of hormone is this most likely to be? a peptide hormone a steroid hormone either a steroid or a peptide hormone either a steroid hormone or an amine hormone either an amine or a peptide hormone

a steroid hormone-This is genomic pathways.

Explanation

Due to their like -dissolve -like forms steroid  hormone  are transported free across the phophoslipid membranes. These hormones on reaching the cytoplasm   may undergo enzyme mediated alteration, and later binded with specific steroid hormone receptors.

In order to enter the cell nucleus , some of these receptors joined together as a sub unit, called a a dimer.

It is this Dimer  which exist as  one functional DNA binding unit that enters the cell nucleus. In the latter the steroid-receptor ligand complex  binds with a specific DNA sequence to bring about transcription of the  targeted gene;to complete genomic pathways.