Pyrolobus fumarii, an extreme thermophile, can survive at a temperature as high as 113°c. this microorganism could be categorized as which of the following?
a. eubacteria
b. archaeabacteria
c. cyanobacteria

Pyrolobus fumarii belongs to the kingdom of archaebacteria that is a thermophile which thrives at very high temperatures as much as 113 C. It was  first discovered in 1997 in a hydrothermal vent where the temperature is as high as that. It belongs to the phylum Crenarchaeota, class Thermoprotei, Order Desulfurococcales and Family Pyrodictiaceae. Answer is B. 

Rna polymeras should attache to the promoter.