NEET BIOLOGY

Detailed explanation-1: -A mass bloom of halophilic archaea developed in the Dead Sea in the summer of 1992, with peak densities of more than 3 × 107 cells/ml, imparting a red coloration to the water.

Detailed explanation-2: -The Archaea are single-celled organisms with no nucleus or organelles. They reproduce asexually by fission or budding and no species are known to produce spores. Analysis of ribosomal RNA sequences has led to a classification of these organisms as separate from the Bacteria (Fig. 8.1).

Detailed explanation-3: -Bacteria and Archaea seem to have a lot in common at first. The organisms in these domains don’t have a nucleus and therefore are called prokaryotes, a combination of the Greek words ‘pro’ (before) and ‘karyon’ (nut or kernel). Just as the name implies, the domain Bacteria contains bacteria.

Detailed explanation-4: -Inhabitants of domain Archaea are more closely related to eukaryotic cells than they are to bacteria. Whereas both bacteria and archaea lack a nuclear envelope and membrane-bound organelles, archaea and eukaryotes have similarities beyond those seen between bacteria and eukaryotic cells.