IMMUNOLOGY

Detailed explanation-1: -Bacteria are single celled microbes that lack a nucleus. Archaea are like bacteria, but they have different structures and properties. This gives them the ability to live in extreme environmental conditions. Protozoa are unicellular microorganisms that have nuclei.

Detailed explanation-2: -Prokaryotes are organisms whose cells lack a nucleus and other organelles. Prokaryotes are divided into two distinct groups: the bacteria and the archaea, which scientists believe have unique evolutionary lineages. Most prokaryotes are small, single-celled organisms that have a relatively simple structure.

Detailed explanation-3: -Does Bacteria Have a Nucleus? Bacteria cells are prokaryotic cells; therefore, they lack a nucleus. In eukaryotic cells, the nucleus is where the DNA is housed. However, in bacteria cells, the DNA or genetic information is found floating freely in the cytoplasm of the cell.

Detailed explanation-4: -Bacteria, of course, have no nucleus and therefore also nuclear membrane. genetic information-DNA is organized into numerous chromosomes and is packaged in the nucleus. The nucleus is bounded by a membrane mRNA, tRNA and rRNA are made in the nucleus and shipped out into the cytoplasm.

Detailed explanation-5: -Prokaryotes are single-celled organisms that lack a well defined nucleus. Single celled organisms like bacteria and archaea are prokaryotic in nature.

Detailed explanation-6: -Life on earth is classified into three domains: Bacteria, Archaea and Eukarya. The first two consist completely of single-celled microbes. None of them have a nucleus. The third domain, Eukarya, consists of organisms whose cells have a nucleus.

Detailed explanation-7: -Bacteria are single-celled, prokaryotic organisms in comparison to animals and plants which are multicellular, eukaryotic organisms. Because bacteria are prokaryotic, they do not have a nucleus and no membrane-bound organelles.