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

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 represents the genetic material of organisms in Kingdom $Monera$?

Select the incorrect statement for $Mycoplasma$:

Bacteria are considered primitive organisms because they

Spliceosomes are not found in the cells of .............