Eight-year-old randy has behavioral difficulty in school and is overly aggressive with the other children. his parents seem to ignore his problems and blame the school and the other children. his parents are convinced that randy has attention-deficit/hyperactivity disorder. when they take him to a child psychiatrist, the psychiatrist is reluctant to give the diagnosis after observing the unhealthy interactions between the family members and between the parents. the psychiatrist's reluctance to give this diagnosis is based on the related to the cause and diagnosis.

Poliovirus is an rna virus of the picornavirus group, which uses its rna as mrna. at its 5' end, the rna genome has a viral protein (vpg) instead of a cap. this is followed by anontranslated leader sequence, and then a single long protein-coding region (~7000 nucleotides), followed by a poly-a tail. observations were made that used radioactive amino acid analogues. short period use of the radioactive amino acids result in labeling of only very long proteins, while longer periods of labeling result in several different short polypeptides. what conclusion is most consistent with the results of the radioactive labeling experiment? a) host cell ribosomes only translate the viral code into short polypeptides.b) the rna is only translated into a single long polypeptide, which is then cleaved into shorter ones.c) the rna is translated into short polypeptides, which are subsequently assembled into large ones.d) the large radioactive polypeptides are coded by the host, whereas the short ones are coded for by the virus.