David Baltimore names a classification scheme for these organisms and also discovered an enzyme used by one type of these organisms. A model organism for these organisms was discovered by Esther Lederberg. The DNA of one of these organisms was labeled with radioactive phosphorus while their protein coat was labeled with radioactive sulfur in the (*) Hershey-Chase experiment. That organism was the T2 phage and that protein coat is their capsid. Another type of these organisms uses the reverse transcriptase enzyme to produce DNA from its RNA genome and is their "retro-" type. For 10 points, name these organisms that reproduce inside host cells 
David Baltimore names a classification scheme for these organisms and also discovered an enzyme used by one type of these organisms. A model organism for these organisms was discovered by Esther Lederberg. The DNA of one of these organisms was labeled with radioactive phosphorus while their protein coat was labeled with radioactive sulfur in the (*) Hershey-Chase experiment. That organism was the T2 phage and that protein coat is their capsid. Another type of these organisms uses the reverse transcriptase enzyme to produce DNA from its RNA genome and is their "retro-" type. For 10 points, name these organisms that reproduce inside host cells and which include HIV.
David Baltimore names a classification scheme for these organisms and also discovered an enzyme used by one type of these organisms.
{virus}es