The following points highlight the three important types of bacteria. The types are: 1. The Ancient Bacteria 2. Gram-Positive Bacteria 3. Gram-Negative Bacteria. Type # 1. The Ancient Bacteria: Most of the phylogenetically primitive bacteria are thermophilic and Gram-negative (except Deinococcus). Some of them have ether-linked membrane lipids like those of archaebacteria. A few representative […]