Viruses are infectious particles lacking their own metabolic machinery. Their large variations in size gives them the capability to infect a wide range of organisms: from the large animals down to even the bacteria. Bacterial viruses, also known as bacteriophages, or simply, phages, have different features that can be similar or distinct from animal viruses. Regardless of target, viruses can either be enveloped or not.
In general, animal viruses differ from bacterial viruses in that _______.
A. the entire virion of an animal virus enters the host cell.
B. only the viral DNA of the virion enters the animal host cell.
C. animal viruses are never enveloped.
D. all animal viruses are lytic
E. None of the above.
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