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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

Winston's baseball team had the bases loaded in the last inning when his friend freddie watched three straight pitches go by without swinging and was called out on strikes out to end the game. how can winston demonstrate responsible behavior in this situation? a. ask the coach sarcastically, in front of the team, if he gave freddie the take sign b. confront freddie and let him know that the team would have won if he could hit c. ignore freddie both after the game and the next day at school d. tell freddie that no one is perfect and to keep his confidence up

The famous scientist galileo galilei did several experiments with sloping planes, which he rolled metal balls down so that he could study motion. by changing the slope, he could study how the speed at which the ball rolled was affected. what was the dependent variable in galileo's experiment?