A virus is a ____ particle that causes disease in susceptible organisms. All viruses have a core of ____ material which can be made of either DNA or ____. This nuclear material is protected within a protein coat called a ____. Some viruses are also surrounded by an envelope of ____ which have been obtained from the host cell ____. These enveloped viruses also possess envelope or "____" proteins which are used by the immune system to detect and recognise the virus as a foreign invader. Viruses were historically classified using their shape or ____. Since the 1970s the ____ system has been used for viral classification. This system classifies viruses based on how they produce their ____. Any viral disease that spreads from ____ to humans is known as a ____. SARS-CoV-2 is an example of a viral zoonosis which allegedly spread from ____ and pangolins to humans in 2019.

Viruses knowledge check

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