You are working on a team that is designing a new drug. for this drug to work, it must enter the cytoplasm of specific target cells which of the following would be a factor that determines whether the molecule selectively enters the target cells? 1) the concentration of the drug molecule that is transported in the blood 2) the phospholipid composition of the target cells plasma membrane 3) the nonpolar, hydrophobic nature of the drug molecule 4) the similarity of the drug molecule to other molecules that are transported into the target cells