In the five-kingdom classification system, all prokaryotes belong to the kingdom monera. which of the following best explains a reason why prokaryotes were separated into different domains, eubacteria and archaea?
a. archaea contain a single dna loop, while eubacteria contain double-stranded, helical dna.
b. unlike eubacteria, archaea are capable of surviving in extreme environments.
c. unlike eubacteria, archaea do not have a membrane-bound nucleus.
d. archaea contain rna, while eubacteria contain both dna and rna.

Option A

Explanation:

The DNA structure of these species i.e Eubacteria and Archaea differ from each other.

The DNA of an archae is called as plasmid which is nothing but the single DNA loop while a  Eubacteria  (like all prokrayotes) consists of genome made up of single, double-stranded DNA molecule. The region that comprise of this genetic material is known as nucleoid. The bacterial chromosome has several proteins and RNA molecules on it

Both arcahe and eubacteria have cellwall and hence they are able to survive in extreme climatic conditions.

Archae has DNA while Eubacteria has both DNA and RNA

Both Archae and Eubacteria are prokaryotes, therefore they do not have membrane-bound nucleus

Hence, option A is correct

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