A molecule /ˈmɒlɪkjuːl/ is an electrically neutral group of two or more atoms held together by chemical bonds.

Molecules are distinguished from ions by their lack of electrical charge. However, in quantum physics, organic chemistry, and biochemistry, the term molecule is often used less strictly, also being applied to polyatomic ions.

see Gene

see Organic molecules

A biological pathway is a series of interactions among molecules in a cell that leads to a certain product or a change in a cell.