The specific control of gene transcription in eukaryotes requires the complex regulation of 1) transcription factors, 2) histone modifying enzymes,...

The specific control of gene transcription in eukaryotes requires the complex regulation of 1) transcription factors, 2) histone modifying enzymes, and 3) chromatin remodeling factors.  In your own words, describe the function of each of these three classes of transcriptional regulators (it may be helpful to use examples from the text) and how each of the components is involved in transcriptional activation and/or repression.

I am able to find information online so please do not just copy and paste I would like a better understanding. Thanks