Question

Which molecules are particles could move through a lipid bilayer without the help of some type of transport protein

1) Small molecules
2) Big molecules
3) Polar molecules
4) non-polar molecules
5) Ions
6) sugar

Answer 1

A membrane transport protein (or simply transporter) is a membrane protein involved in the movement of ions, small molecules, and macromolecules, such as another protein, across a biological membrane.