A woman who is trying to conceive ovulates on day 12 of her monthly menstrual cycle. An ovum can live for up to 24 hours
after it is released, Sperm can live for about three days after entering the female reproductive tract. On which days of the
woman's menstrual cycle would sexual intercourse be most effective in achieving conception?
days 8, 9, and 10
days 11, 12, and 13
days 12, 13, and 14
days 13, 14, and 15

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