What type of microorganism is $Oscillatoria$?

In bacteria,plasmids are .......

Why is a capsule advantageous to a bacterium?

Which kingdom consists of unicellular prokaryotic organisms?

What is the habitat of halophiles?

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.