Question

which of the following models demonstrates simple diffusion through a selectively permeable membrane? model a model b a model b because particles are moving through a transport protein from high to low concentration. b model a because particles are moving directly through the cell membrane with the use of atp. c model a because particles are moving directly through the cell membrane from high to low concentration. d model b because particles are moving through a transport protein without the use of atp.

Explanation:

Simple diffusion is the movement of particles from an area of high - concentration to an area of low - concentration through the cell membrane without the use of energy (ATP) and without the help of transport proteins. Model A shows particles moving directly through the cell membrane from high to low concentration, which is characteristic of simple diffusion. Model B shows particles moving through a transport protein, which is a form of facilitated diffusion or active transport.

Answer:

A. Model A because particles are moving directly through the cell membrane from high to low concentration.