You have a solution of phospholipid vesicles in a test tube. These vesicles have phospholipid bilayers, but do not contain any membrane transporters. You add a number of different molecules to the solution, and wait a period of time for them to equilibrate. If you could measure the concentration of each molecule, for which of the following would you expect to measure equal concentrations inside and outside of the vesicles? Assume for this question that the overall osmolarity inside and outside the vesicles is the same (i. e. there is no appreciable diffusion of water across the membrane). (select two answers) a) an amino acid with a hydrophobic side-chain
b) a small nonpolar molecule like benzene
c) a negatively charged ion like chloride
d) a positively charged ion like sodium
e) a small lipid hormone like estrogen
f) a small polar molecule like glucose incorrect