Biochemical similarities are used in the identification of which of the following?

The process in which viruses are involved in sexual reproduction of bacteria is called

Primitive bacteria living in salty areas are called as

Which of the following is osmotically inactive?

Chlorobium vesicle is present 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.