Which of the following represents a difference between viruses and viroids?

A) Viruses infect many types of cells, whereas viroids infect only prokaryotic cells.
B) Viruses have capsids composed of protein, whereas viroids have no capsids.
C) Viruses have genomes composed of RNA, whereas viroids have genomes composed of DNA.
D) Viruses cannot pass through plasmodesmata, whereas viroids can.


B

Biology & Microbiology

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You are attempting to link an individual to a crime. The only evidence you have is a tiny drop of blood. How can you use this drop of blood to definitively make the association?

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