How to understand the application of traditional biology and molecular biology in classification

The traditional identification and classification technology of microorganisms mainly determines their classification status by comparing their cell morphology and living habits. There are some errors in these methods, because even the same microorganism may have some differences in its morphological, physiological and biochemical characteristics, so it is difficult to identify it accurately. At present, molecular biology technology is developing rapidly. It is simple, rapid, efficient and reliable to identify and classify microorganisms based on nucleic acid level research, which exceeds the traditional methods of microbial identification and classification, and its identification results are more convincing. At present, the commonly used methods to identify and classify microorganisms by molecular biology techniques are: DNA(G+C)mol% value, nucleic acid hybridization, nucleic acid sequence analysis and DNA molecular marker.