Question

Which form of cell transport allows small molecules to move from an area of higher concentration to an area of lower concentration without energy being required from the cell?

A. osmosis
B. pinocytosis
C. phagocytosis
D. simple diffusion

Answer 1

The most appropriate answer would be D. simple diffusion.

Simple diffusion is term used when molecules move from the region of region higher concentration to the region of lower concentration across the semi permeable membrane.

It is passive mode of transport takes place across the cell. Hence, it does not require energy.

Example may include the diffusion of gases (oxygen and carbon dioxide) across the cells.

Answer 2

I think the correct answer from the choices listed above is option D. Simple diffusion is the cell transport that allows small molecules to move from an area of higher concentration to an area of lower concentration without energy being required from the cell.