40. The regulator gene codes for the DNA-binding proteins that act as repressors. 41. All genes are active at the same time in a prokaryotic cell and controlled by positive regulation, but not in a eukaryotic cell. 42. Once proteins are made and functional, they are no longer subject to cellular control. 43. The genes of a single operon are all regulated by the same repressor, operator, and promoter. 44. In the transcription of DNA, remodeling proteins push the histone portion of the nucleosome aside so that transcription may begin. Â Â