NEET BIOLOGY

Detailed explanation-1: -To their surprise they discovered unicellular (one cell) organisms in the samples. These organisms are today classified in the kingdom, Archaebacteria. Archaebacteria are found in extreme environments such as hot boiling water and thermal vents under conditions with no oxygen or highly acid environments.

Detailed explanation-2: -Key Points. Archaea are single-celled microorganisms that lack a cell nucleus and membrane-bound organelles.

Detailed explanation-3: -Archaebacteria are not multicellular. They are unicellular organisms that are made up of only one cell.

Detailed explanation-4: -Bacteria and arachaea are unicellular and lack a nucleus.

Detailed explanation-5: -Both Bacteria and Archaea are prokaryotes, single-celled microorganisms with no nuclei, and Eukarya includes us and all other animals, plants, fungi, and single-celled protists – all organisms whose cells have nuclei to enclose their DNA apart from the rest of the cell.