Final Answer:
rRNA genes for RNA polymerase III use type 1 promoters.
Step-by-step explanation:
RNA polymerase III is responsible for transcribing genes that encode small structural RNAs, such as 5S ribosomal RNA (rRNA), transfer RNAs (tRNAs), and some small nuclear RNAs (snRNAs). The promoters for RNA polymerase III are classified into two types: type 1 and type 2.
For rRNA genes transcribed by RNA polymerase III, the promoters are of type 1. Type 1 promoters have an internal control region that includes the transcription start site and an upstream element. Transcription factors like TFIIIC bind to these elements, facilitating the recruitment of RNA polymerase III for transcription initiation. The intricate interplay between these factors ensures the precise and regulated transcription of rRNA genes.