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

Which of the following has polar nodules on both ends?

Which of the following is not found in $Eubacteria$?

Mycoplasma are not sensitive to:

Choose the correct statements $(i - iv)$ regarding mycoplasma:
$(i)$ Mycoplasma has no cell wall.
$(ii)$ Mycoplasma is the smallest living organism known.
$(iii)$ Mycoplasma cannot survive without $O_2$.
$(iv)$ Mycoplasma are pathogenic in animals and plants.

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