上降充通大睾 Shanghai Jiao Tong University 1.3 Microorganisms A large and diverse group of microscopic organisms that exist as single cells or cell clusters,it also include non-cellular life forms such as viruses and prions.微生物：微小的细胞或非细胞生物 Chen Feng,Shanghai Jiao Tong UniversityShanghai Jiao Tong University Chen Feng, Shanghai Jiao Tong University 1.3 Microorganisms A large and diverse group of microscopic organisms that exist as single cells or cell clusters, it also include non-cellular life forms such as viruses and prions.微生物：微小的细胞或非细胞生物