The cells of the bacterium $Staphylococcus$ remain arranged in the form of:

Methanogens are present in the $\dots$ of the digestive tract of cattle.

Which of the following statements is incorrect regarding $Mycoplasma$?

Which of the following antibiotics is found to be most effective against Mycoplasma?

There is no alternation of generation in $Escherichia$ $coli$ because of the absence of

Assertion $(S)$: Thermoacidophiles can survive in acidic and high-temperature conditions.
Reason $(R)$: Archaea can survive in extreme conditions.