Final answer:
The host range of a virus depends on the presence of host receptor molecules.
Step-by-step explanation:
The statement The host range of a virus depends on the presence of host receptor molecules. is True. A virus attaches to a specific receptor site on the host cell membrane through attachment proteins in the capsid or via glycoproteins embedded in the viral envelope. The specificity of this interaction determines the host—and the cells within the host—that can be infected by a particular virus. Chemical differences in the cell-surface receptors among hosts mean that a virus that infects a specific species often cannot infect another species.