Dear student
1. Its Viroids. Void is an empty space or hole (with respect to chemistry)
Viroids are infectious free RNA particles which are devoid of protein coat unlike viruses and are obligate parasites. They were discovered by T.O. Diener in 1971.
2. A bacteriophage is a virus that infects and replicates within a bacterium. It is composed of protien that encapsulated a DNA or and may have relatively simple or elaborate structures.
Regards