Which domain of organisms can survive in extreme conditions?

Which kingdom consists of organisms that possess a nucleoid?

Provide the full forms of the following abbreviations:
$(i)$ $PPLO$
$(ii)$ $RNA$

Select the incorrect statement.

Which of the following are likely to be present in deep sea water?

Assertion $A$: Some bacteria are motile.
Reason $R$: Some bacteria have tubular pili or fimbriae extensions arising from their surface.
Which option is correct for Assertion $A$ and Reason $R$?