Describe the evolution of microbiology from the Golden Age to the Molecular Age today 2-Explain why Whittaker’s 5-domain system was changed to three domains in the 1990’s

Explain the data

The "RNA world hypothesis"... maintains that RNA originally served as the main energy source of cells and gradually evolved to have a genetic function. Ospeculates there was a time in earth's history when RNA served both as rudimentary genetic material and the primary catalyst of life. Ohypothesizes that RNA viruses were the first life forms and later evolved into DNA based microbes assumes RNA was a key ingredient in the first primitive membranes that formed protobionts. Later, it migrated inside of "proto-cells" and took on a hereditary function. has largely been discredited by most researchers studying the origins of life on earth. It is now widely believed that DNA preceded RNA.

2. The Six Kingdoms How do we group organisms into kingdoms? Organisms are grouped in kinedoms based on 5 different characteristics: AALIA FUNG iouer arytic PLANTA e ryaticd PROTISTA war mutioelia Bubary 1. 2. Cell structures 3. Number of cells EUBACTERIA nicellar prokaryotic ABCHASBACTERIA der, prokaryoti 4. Mode of 5. Motile or non-motile Characteristics of the Six Kingdoms Nutrition Mobility Examples Domain Kingdom Cell Type Cell Structure # of Cells Some Bacteria Eubacteria Prokaryote unicellular can move Archaea Archaebacteria Cell walls Autotroph or Methanogens, without heterotroph halophiles peptidoglycan Protista Most unicellular, Some Eukaryote some can colonial, move some multi Plantae Cell walls of cellulose. Mosses, ferns, autotroph Contain flowering plants