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.

According to Lynn Margulis's theory of endosymbiosis, bacteria entered large cells either as parasites or as undigested prey as illustrated. All the following are proof that mitochondria and chloroplast evolved from bacteria, except: Endosymbiosis in a nutshell: 1. Start with two 2. One bacterium engulfs the other. 3. One bacterium now lives inside the other. independent bacteria. 4. Both bacteria benefit from the arrangement. 5. The internal bacteria are passed on from generation to generation. O a they each have a double membrane they have chromosomes similar in shape to their host they are the size of bacteria their DNA is different from its host