Which of the following best defines dynamic stretching? a. dynamic stretching features slow, deliberate, controlled motions useful for activity preparation and reducing muscle tightness. b. dynamic stretching features bouncing and swift motion useful for increasing range of motion. c. dynamic stretching features stationary stretching useful for increasing muscle power and elongating muscles. d. dynamic stretching features stationary stretching with a partner useful for increasing muscle potential. a

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