Multiple choice

A division of the circular single-stranded viruses has been proposed for easy and convenient study. Which of the following types of genomes is characterised by a small circular DNA genome?

  1. Type I genomes

  2. Type II genomes

  3. Type III genomes

  4. Type IV genomes

  5. Type V genomes

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A Correct answer
Explanation

Type I genomes are characterized by a small circular DNA genome (approximately 2-kb), with the Rep protein and the major open reading frame (ORF) in opposite orientations. This type is characteristic of the circoviruses, geminiviruses and nanoviruses.