A newly identified virus has a single-stranded RNA genome that is used as mRNA after infection. Its capsid is 25-30 nm in diameter and contains 180 identical capsomeres. Which of the following processes would be the best to follow to analyze the reproduction of this virus in a host cell?

Question

BlackTom AI · Accepted Answer

Contextualizing the virus: it has a single-stranded RNA genome that acts as mRNA upon entry into the host cell, and the virion has a small, icosahedral-like capsid with 180 identical subunits. This means translation of the viral RNA into proteins happens directly after infection, without the need for transcription of a DNA intermediary or splicing.
Option 1: transcription rate. Since the genome itself functions as mRNA, there is no separate transcription step from DNA to RNA to analyze; transcription is not the rate-limiting or relevant process for an RNA virus that serves directly as mRNA. Therefore, tracking transcription rate would not yield meaningful insights into its replication.
Option 2: DNA replication rate. DNA replication is not involved for a positive-sense single-stranded RNA virus that acts as mRNA; there is no DNA genome to replicate in the host nucleus or cytoplasm for this virus, so this option is inappropriate.
Option 3: translation rate. Because the viral RNA acts as mRNA immediately, translation of viral proteins by the host ribosomes is the primary early step in replication. Measuring how quickly viral proteins are produced (translation rate) directly informs how efficiently the virus can propagate, making it the best process to monitor.
Option 4: mRNA splicing. Splicing typically applies to intron-containing eukaryotic pre-mRNA processing. A positive-sense viral RNA genome that functions as mRNA generally does not require splicing to produce viral proteins, so this process is unlikely to be relevant for this virus.
Option 5: lipid synthesis in smooth ER. Lipid synthesis is part of membrane production and can be involved in enveloped viruses or cellular metabolism, but for analyzing early replication of this non-enveloped, positive-sense RNA virus that uses host machinery for translation, lipid synthesis is not a direct measure of its replication efficiency.
In summary, among the choices, translation rate best captures the key step by which this specific virus produces its proteins and propagates inside the host, whereas the other options involve processes that are either not required or not informative for this virus’s replication.

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