Question

Moneran phylogeny is best evidenced by sequence of nucleotides in RNA of ribosomes. On the basis of this information, the most primitive monerans are

• A. Archaebacteria
• B. Eubacteria
• C. Filamentous bacteria
• D. Cyanobacteria

Answer 1

The correct option is A Archaebacteria

• The name Archaebacteria, with its prefix meaning 'ancient'. Archaea constitute a domain of single celled microorganisms. These microbes are prokaryotes, meaning they have no cell nucleus. Archaebacteria have large differences in their ribosomal RNA structure. The particular RNA molecule sequenced, known as 16S rRNA, is present in them.
  
• They are the primitive bacterium of Moneran kingdom. The discovery of Archaea and its unique differences is exciting for scientists because it is believed that Archaebacteria's unique biochemistry might give us insight into the workings of very ancient life.
• Another remarkable trait of Archaebacteria is their ability to survive in extreme environments, including very salty,very acidic, and very hot surroundings.

So the correct option is Archaebacteria.