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What job do the matrix proteins of an enveloped virion perform?
AThey cut host glycoproteins on release
BThey copy the viral genome in the core
CThey stabilise the envelope and aid assembly
DThey bind the viral receptor on the host
Answer & Solution
Correct answer: C. They stabilise the envelope and aid assembly
1. An enveloped virion carries two classes of envelope protein.
2. Glycoproteins embedded in the envelope handle attachment to the host cell.
3. Matrix proteins are the other class, and they stabilise the envelope.
4. Matrix proteins also often help assemble progeny virions.
5. Attachment is the job of the glycoproteins, so the receptor-binding option names the wrong protein.
_Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 21 "Viruses", section 21.1 Viral Evolution, Morphology, and Classification_
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