Question

A small molecule that is lipid-soluble is likely to cross the cell membrane via? Osmosis, active transport, diffusion, facilitated diffusion, or group translocation?

Answer 1

A small lipid soluble molecule is likely to cross the cell membrane via diffusion. Diffusion is a passive transport mechanism, in which molecules moves from high concentration to low concentration. Lipid molecules easily diffuse through the cell membrane by the process of diffusion. Osmosis is movement of solvent molecules from a region of lower solute concentration to higher solute concentration through a semi-permeable membrane. Facilitated diffusion is a process by which molecules pass through the membrane via transmembrane integral proteins. Active transport is a process, in which movement of molecules through cell membrane takeplace from a region of lower concentration to a region of higher concentration against concentration gradient with expense of ATP molecules