2. What physical structure do all viruses have in common? 1.Capsid 2.Tegument 3.Envelope 4.Histones

3. Which of the following statements is the most correct? 1.Viruses can have an icosahedral capsid or an envelope, but not both. 2.Helical capsids are always surrounded by an envelope. 3.Icosahedral capsids are only found among DNA viruses. 4.Icosahedral capsids are very large.

4. Which of the following statements is the most correct? 1.Viruses can have an icosahedral capsid or an envelope, but not both. (not true; Herpes virus has both!) 2.Helical capsids are always surrounded by an envelope. 3.Icosahedral capsids are only found among DNA viruses. (not true; can be found among RNA viruses) 4.Icosahedral capsids are very large. (not true; most are 20-30 nm)