Multiple choice

A division of the circular single stranded viruses has been proposed for easy and convenient study. Which among the following types of genomes is characterised by 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.