Bacterial cells can be stained with

Green bacteria contain:

Nuclear material without a nuclear membrane is observed in

Consider the following four statements $(A-D)$ and select the option which includes all the correct ones only.
$(A)$ Archaebacteria differ from other bacteria in having a different cell wall structure.
$(B)$ Bacteria as a group show the most extensive metabolic diversity.
$(C)$ All Eubacteria have chlorophyll ' $a$' pigment similar to green plants.
$(D)$ Mycoplasma can survive without oxygen.

Which of the following microorganisms possess the property of both photosynthesis and nitrogen fixation?

What type of nutrition is exhibited by organisms of the Kingdom Monera?