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 B
Explanation
A. Water: Pure water has a neutral pH of around 7 and does not resist changes in pH when acids or bases are added, so it does not function as a stabilizing solution in this case.
B. A buffer: A buffer is a solution that resists changes in pH by neutralizing added acids or bases. The ability of the solution to maintain a pH of 4 despite the addition of a base indicates it is functioning as a buffer system.
C. An alcohol: Alcohols are organic compounds containing hydroxyl groups, but they do not regulate pH levels or provide stability against pH changes in solution.
D. Organic: Being organic only means the compound is carbon-based, which does not automatically imply it has buffering capacity or pH stability.
Correct Answer is D
Explanation
A. fish: Fish are a source of other parasitic infections such as Diphyllobothrium latum (fish tapeworm), but they are not the intermediate host for Taenia saginata.
B. ducks: Ducks may carry parasites and bacteria transmissible to humans, but they are not associated with transmission of Taenia saginata.
C. pigs: Pigs serve as the intermediate host for Taenia solium (pork tapeworm), not Taenia saginata.
D. cows: Cattle are the intermediate host for Taenia saginata (beef tapeworm). Humans acquire the infection by consuming undercooked or raw beef containing larval cysts.
E. chickens: Chickens can transmit other pathogens such as Salmonella, but they are not involved in the life cycle of Taenia saginata.
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