Question

Viruses are composed of O proteins, RNA and ribosomes O single stranded DNA O double stranded DNA and RNA Single stranded RNA O RNA or DNA, but never both, and a protein coat

Answer 1

RNA or DNA but never both and aprotein coat.

Viruses contain genetic material either in the form of DNA or RNA and this genetic material is covered by a protein coat called as Capsid. And in some viruses Capsid is surrounded by a spikey coat called envelope. Capsid protect the viral genetic material from degradation by the enzymes like nucleases.