What would result if a specific sigma subunit of bacterial rna polymerase is mutated?

RNA polymerase would begin transcription unsystematically on the DNA. Additionally, an in vitro transcription process changes a bacterial gene however it terminates inefficiently. Furthermore, if a specific sigma subunit of bacterial RNA polymerase is mutated, RNA polymerase would not be successful in initiating transcription at the promoter specifically to the sigma subunit.

the darker peppered moth species were favored due to the fact that the industrial revolution had made all the nearby trees a darker color instead of white.

sheep is a herbivore animal whereas grasshopper belongs to the class chordates but both of them feed on greens.  

if grasshopper and sheep feeding on a pasture land, i do not think both of them will have any impact on each other. however, the number of the species can make difference. since sheep feed on greens, there is a possibility there left no pasture land for the grasshoppers or they may get extinct.