You are caring for a 25-year-old male patient that has been shot once in the head. the patient has a noticeable breathing pattern that alternates between apnea (no breathing) and hyperpnea (fast breathing). your understanding of pathophysiology leads you to believe the breathing pattern may be due to damage to the section of his brain responsible for respiratory control, also known as the:

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