When a virus in a host cell reproduces its own kind, it is an organism, and very active. Outside the host cell, the virus has no signs of a living organism.
The exceptionally primitive structure of the virus, the simplicity of its organization, the absence of cytoplasm and ribosomes, as well as its own metabolism, small molecular weight – all this, distinguishing viruses from cellular organisms, provides the basis for discussing the question: what is a virus – a creature or substance, living or nonliving ? Scientific debates on this topic have been going on for a long time. However, now, thanks to a thorough study of the properties of a huge number of types of viruses, it has been established that the virus is a special form of life, although it is very primitive. The structure of the virus, represented by its interacting main parts (nucleic acid and proteins), structural certainty (core and protein coat – capsid), its maintenance of its structure make it possible to consider the virus as a special living system – an organism-level biosystem, although it is very primitive.
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.