上浒充通大淫 SHANGHAI JIAO TONG UNIVERSITY 9.1 General properties of viruses Extracellular state胞外形式 Is a minute particle containing nucleic acid surrounded by protein(and occasionally,containing other macromolecular components) ·Virus particle/virion:metabolically inert毒粒：代谢隋性 ©Intracellular state胞内形式 Virus Replication occurs:New copies of virus genome are produced,and the virus coat components are synthesized. Infection the process when a virus genome is introduced into a host cell and reproduces感染 Chen Feng,Shanghai Jiao Tong UniversityChen Feng, Shanghai Jiao Tong University 9.1 General properties of viruses Extracellular state胞外形式 • Is a minute particle containing nucleic acid surrounded by protein (and occasionally, containing other macromolecular components) • Virus particle/virion: metabolically inert毒粒:代谢隋性 Intracellular state胞内形式 • Virus Replication occurs: New copies of virus genome are produced, and the virus coat components are synthesized. • Infection : the process when a virus genome is introduced into a host cell and reproduces感染