SEARCH Articles Figures Tables Enzymes That Catalyze Amino Acid Biosynthesis Are Regulated at the Level of Transcription Initiation Formation of a Basal Transcription Apparatus from General Initiation Factors and RNA Polymerase Overview of Transcription Initiation in Procaryotes Promoter initiation of transcription Regulation of transcription initiation Transcription initiation Transcription of genetic information initial transcribing complex Transcription of genetic information initiation