Question

What are the functions of three types of RNAs in bacteria? Which enzyme is involved in transcription of DNA to form RNAs in bacteria? What is its function?

Answer 1

1. In bacteria, m-RNA provides the encoded message for protein synthesis; t-RNA brings specific amino acid to the site of translation; r-RNA plays role in providing binding site to m-RNA and tRNA.

2. There is single DNA dependent-RNA polymerase that catalyses transcription of all 3 types of RNA in bacteria. 

3. RNA polymerase binds to promoter and initiates transcription (initiation) and synthesizes RNA.