USMLE Exam Prep

Category - Free USMLE Practice Test Questions

Each of the following is an RNA enveloped virus EXCEPT:
  1. poliovirus
  2. rubella virus
  3. human T-cell leukemia virus
  4. human immunodeficiency virus
Explanation
Answer: A - The polio virus, of the family picornavirus, is an RNA nonenveloped virus.
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