You are assessing a 26-year-old woman who is 38 weeks pregnant and is in labor. She tells you that she was pregnant once before, but had a miscarriage at 19 weeks. You should document her obstetric history as:

Aresearcher lyses a cell that contains nucleic acid molecules and capsomeres of tobacco mosaic virus (tmv). the cell contents are left in a covered test tube overnight. the next day this mixture is sprayed on tobacco plants. we expect that the plants would ) develop some but not all of the symptoms of the tmv infectionb) develop the typical symptoms of tmv infectionc) not show any disease symptomsd) become infected, but the sap from these plants would be unable to infect other plants