1) Which statement best describes the interaction of host antibodies (made after viral infection and/or vaccination) with viral antigens? a) Antibodies bind to a virion's surface proteins and can prevent the virus from infecting a host cell. b) Antibodies enter an infected host cell and can destroy the intracellular virus. c) Antibodies bind to a host cell's receptors and can block viruses from binding there. 2) Infection by certain viruses can cause cancer when the virus... prevents proto-oncogene expression in host cells. causes host cells to divide too much. immediately multiplies and lyses host cells. causes over-expression of tumor suppressor genes in host cells. 3) Prions are infectious agents composed of... polysaccharide. nucleic acid. protein. lipid. .