简答题Reverse transcriptase is a(n) A、DNA-dependent DNA polymerase B、RNA-dependent DNA polymerase C、RNA-dependent RNA polymerase D、DNA-dependent RNA polymerase简答题For the negative-stranded RNA viruses, the RNA genome itself can serves as mRNA. A、True B、False简答题Enveloped viral membranes are generally lipid bilayers with associated virus-specific ________. A、polysaccharides B、phospholipids C、lipids D、glycoproteins简答题Viral size is generally measured in A、micrometers B、nanometers C、picometers D、centimeters简答题Temperate viruses can enter into either a lytic or lysogenic cycle. A、True B、False简答题Viral replication occurs________. A、intracellularly B、extracellularly C、both intracellularly and extracellularly D、either intracellularly or extracellularly简答题In the virion, the complete complex of nucleic acid and protein is called_________. A、nucleocapsid B、capsid C、concatemer D、envelope简答题The term "phage" is generally reserved for the viruses that infect bacteria. A、True B、False简答题A virus that kills its host is said to be______. A、lysogenic B、temperate C、lytic or virulent D、temperate or lysogenic简答题Viruses have only an intracellular form because they can only replicate in host cells. A、True B、False