Substances insoluble in a membrane are carried across the membrane with the concentration gradient by means of a carrier molecule in a process known as: a) osmosis. b) diffusion. c) active transport. d) facilitated diffusion.
option d. In facilitated transport, additionally known as facilitated diffusion, fabric movements throughout the plasma membrane with the help of transmembrane proteins down a awareness gradient (from excessive to low awareness) with out the expenditure of cell energy.
