Final answer:
The -35 and -10 consensus sequences in bacterial transcription are TTGACA and TATAAT, respectively, and they are crucial for the initiation of transcription by aiding in the binding of sigma factor and RNA polymerase.
Step-by-step explanation:
In bacterial transcription, the two key regulatory consensus sequences are the -35 and -10 regions. The -35 sequence is TTGACA and the -10 sequence, often called the TATA box, is TATAAT. These consensus sequences are essential for the binding of the sigma factor and the RNA polymerase, initiating the transcription process. The A-T-rich -10 region facilitates the unwinding of the DNA template, allowing transcription to begin. These sequences are conserved across many bacterial species, indicating their critical role in gene expression.