Question

In which of the following is true bacteria?
A. Archaebacteria
B. Cyanobacteria
C. Eu Bacteria
D. Both B and C

Answer 1

Hint: Kingdom Monera's members may be unicellular, but that does not make them any less complicated. Under a microscope, two eubacteria and archaebacteria appear similar: two single-celled species without a nuclear membrane. Both of them are prokaryotes. Prokaryotes are cells without a membrane-bound by the nucleus, mitochondria, and few or no cell organelle.

Complete answer:
A type of single-celled organism that differs from other modern types of life is Archaebacteria. They are a group of microorganisms that are believed to be the oldest living organism or an ancient life type and are known to have formed separately from blue-green algae and bacteria. Members of these groups (Archaebacteria) lack peptidoglycan and contain more eukaryotic-like RNA polymerases and ribosomal proteins than those in eubacteria.
In some books, eubacteria referred to as "true bacteria" are a domain consisting of all the common bacteria classes. As such, all species that fall within the Bacteria domain consist of these. While all groups that fall within this domain are prokaryotes, their general morphology, metabolism, and habitats show high variations and diversity. This has allowed various forms of bacteria in nature to be identified and described. Some of the bacteria classes that come under the Eubacteria domain include Cyanobacteria, Proteobacteria, Spirochetes, Gram-positive bacteria, and Chlamydias.

So, the correct answer is an option (D).

Note:
Compared to archaebacteria, some of the classes of bacteria that come under Eubacteria were studied more thoroughly by human beings. In most hostile environments, including volcanic vents, archaebacteria typically live. So, studying them in nature is more difficult. Many of the bacteria that we care for and know to belong to eubacteria. Eubacteria can be present in a range of environments, such as in food, the human body, and basically in the surrounding environment.