Which one is the smallest organism capable of autonomous growth and reproduction?

What is the full form of $PPLO$?

Cell wall is absent in

Mycoplasma can be cultured on

What is the genetic material of cyanobacteria known as?

Select the correct statements from the given statements $(1-4)$ regarding the characteristics of some organisms.
$(1)$ Methanogens are Archaebacteria that produce methane in marshy areas.
$(2)$ $Nostoc$ is a flagellated blue-green alga that fixes atmospheric nitrogen.
$(3)$ Chemosynthetic autotrophic bacteria synthesize cellulose from glucose.
$(4)$ Mycoplasma lacks a cell wall and can survive without oxygen.