Viruses From Animal and Plants
Viral matrix proteins are

anchor the envelope of enveloped viruses
found mainly on naked viruses
part of the nucleoprotein core of viruses
exposed on the surface of the virus

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Viruses From Animal and Plants
Influenza virus undergoes antigenic shift resulting in major antigenic changes by which of the following mechanisms?

Expression of several different capsule types
Somatic recombination of heavy and light chains
Reassortment of RNA segments from different influenza viruses
Changing the receptor binding canyon that docks with the host receptor

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