<prompt> Which of the following viruses possesses DNA, a capsid with icosahedral symmetry and no lipid envelope -a Herpesvirusb Adenovirusc Poxvirusd Papovaviruscbdabac  <response>: All nonenveloped viruses whether DNA or RNA have icosahedral symmetry.Nonenveloped DNA viruses PAP - PApova, Adeno, PArvoNonenveloped RNA viruses PCR - Picorna, Calci, Reo.Also knowAll DNA viruses whether enveloped or nonenveloped have icosahedral symmetry except poxvirus which has complex symmetry.No DNA virus has helical symmetry.RNA viruses have either icosahedral or helical symmetry :Icosahedral symmetry Nonenveloped RAN viruses PCR Picorna, Calci, Reo and Retro, Flavi, Toga, Remember - RFT.Helical symmetry Rest of the RNA viruses. 