Which of the following statements about using condoms to reduce the risk of STIs is TRUE? 1. Condoms treated with the spermicide nonoxynol-9 are more effective than plain latex condoms.
2. Condoms frequently fail, so people should not rely on them to reduce the risk of STIs.
3. It is safe to use condoms that are past their expiration date just so long as they have been stored properly.
4. Latex condoms are effective at preventing the transmission of most STIs.

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