All GRE Subject Test: Biochemistry, Cell, and Molecular Biology Resources
Example Questions
Example Question #1 : Viruses
Which of the following is true about viral genomes?
Possible Answers:
Viral genomes can be either RNA or DNA
Viral genomes are incapable of undergoing recombination events
Viral genomes are always circular
Viral genomes typically consist of 20,000+ genes
Correct answer:
Viral genomes can be either RNA or DNA
Explanation:
The human genome contains 20,000-25,000 genes, so, as one might expect, viral genomes are typically much smaller than this. Viral genomes can either be circular or linear, and both formats are susceptible to recombination events.
Different classes of viruses have different nucleic acid genomes. Double-stranded DNA, single-stranded DNA, double-stranded RNA, and single-stranded RNA can all be found in certain virions.
All GRE Subject Test: Biochemistry, Cell, and Molecular Biology Resources
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