What is the approximate diameter of retroviruses?
Correct answer: B. 100 nm
- A. 150 nm
- B. 100 nm
- C. 200 nm
- D. 250 nm
Explanation
The virions are 80-100 nm in diameter, and their outer lipid envelope incorporates and displays the viral glycoproteins (Fig. 1). The shape and location of the internal protein core are characteristic for various genera of the family.
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About Viruses
Viruses are acellular infectious particles made of genetic material enclosed by a protein capsid, sometimes with a lipid envelope. Their replication depends on a host cell and may follow lytic or lysogenic cycles, so viral structure and reproduction differ fundamentally from those of cellular organisms such as bacteria.
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