Which of the following is an accurate description of a virion?
the nucleic acid of a viral pathogen
a mature infectious particle of protein and nucleic acid
a population of infectious particles
the protein portion of a viral particle
the nucleic acid of a viral pathogen inside a host cell
The Correct Answer is B
A. the nucleic acid of a viral pathogen: Viral nucleic acid is a component of a virus, but by itself it does not constitute a virion. A complete virion must include both nucleic acid and a protective protein coat.
B. a mature infectious particle of protein and nucleic acid: A virion is the fully assembled, extracellular, and infectious form of a virus. It consists of viral nucleic acid (DNA or RNA) encased in a protein capsid, and in some cases, an envelope derived from the host cell.
C. a population of infectious particles: This describes multiple virions, but the term virion specifically refers to a single, complete viral particle.
D. the protein portion of a viral particle: The protein portion alone is called the capsid, not a virion. The capsid is necessary for protection and attachment but does not represent the full infectious particle.
E. the nucleic acid of a viral pathogen inside a host cell: Once inside the host cell, the virus exists as genetic material engaging in replication, but this is not considered a virion since it is no longer in its extracellular, infectious state.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is True
Explanation
True: Fungi have versatile reproductive strategies. They can reproduce asexually through methods such as budding, fragmentation, and spore formation, which allows rapid population increase. They can also reproduce sexually through the fusion of specialized cells, promoting genetic diversity and adaptation to changing environments.
Correct Answer is C
Explanation
A. activity of a bacteriophage: This describes the cause of the clear zone, since bacteriophages infect and lyse bacterial cells, but it is not the correct term used for the zone itself.
B. colony: A colony is a visible cluster of bacterial cells originating from a single progenitor cell, not a clear zone caused by viral lysis.
C. plaque: A plaque is the clear area formed on a bacterial lawn where bacteriophages have infected and destroyed bacterial cells. It represents viral activity and spread.
D. lawn: A lawn refers to the uniform layer of bacterial growth on the agar surface, which serves as the background where plaques can be observed.
E. culture: A culture is the overall growth of microorganisms in a medium, not the specific clear zone produced by bacteriophage activity.
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