<prompt> Neutral molecules are transpoed by:Porin channelsIonophoresSimple diffusionNone of the above  <response>: Absence of charge over molecules UnchargedNeutral molecules ours their transpo by simple diffusion. Small neutral molecules are usually transpoed freely across plasma membranes by simple diffusion. Ref: Ganongs Review of Medical Physiology, 22nd Edition, Page 31; Biochemistry By Mary K. Campbell, Shawn O. Farrell, 7th Edition, Page 209; Harpers Textbook of Biochemistry, 27th Edition, Pages 108, 424, 433 