A. infectivity requires an envelope protein provided by
a helper virus.
B. it has an RNA genome that is replicated by a repli
case supplied by a coinfecting helper virus.
C. its mRNA is transcribed by a transcriptase sup
plied by a helper virus.
D. the virion contains a reverse transcriptase pro
vided by a helper virus.
E. it encodes a protein (HDAg) that replaces helper
virus glycoproteins in the envelopes of helper virus