Viruses From Animal and Plants
Viral matrix proteins are

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

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Viruses From Animal and Plants
Negative strand ssRNA viruses need to have a preformed replicase when they invade a mammalian cell because they

use it to terminate transcripts when they copy host cell mRNA
have to make a positive strand copy that can be translated
use it to modify host enzymes that are recruited for viral replication
None of these

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