Influenza a subtype h5n1 (avian flu) has been documented in poultry in both east and southeast asian countries. this form of avian flu is highly contagious from bird to bird but rarely is passed from human to human. there is a large amount of concern that the h5n1 strain might mutate, making it easier to be passed from human to human, carrying with it a high mortality rate. what is the main concern if the h5n1 strain does mutate?

You isolate an infectious substance capable of causing disease in plants, but you do not know whether the infectious agent is a bacterium, virus, viroid, or prion. you have four methods at your disposal to analyze the substance and determine the nature of the infectious agent.i. treat the substance with enzymes that destroy all nucleic acids and then determine whether the substance is still infectious.ii. microscope.iii. culture the substance on nutritive medium, away from any plant cells.iv. treat the sample with proteases that digest all proteins and then determining whether the substance is still infectious.if you already know that the infectious agent was either bacterial or viral, which method(s) listed above would allow you to distinguish between these two possibilities? a) ib) iic) ii or iiid) iv