Which of the following statements concerning viruses is true? View Available Hint(s) Which of the following statements concerning viruses is true? Viruses possess enzymes for protein synthesis and ATP generation. The "host range" for a virus is determined by the presence or absence of particular components on the surface of a host cell that are required for the virus to attach. Viruses are usually about the same size as bacteria. Viruses contain both DNA and RNA, and they undergo binary fusion.