AP BIOLOGY

Detailed explanation-1: -Small uncharged polar molecules, such as H2O, also can diffuse through membranes, but larger uncharged polar molecules, such as glucose, cannot. Charged molecules, such as ions, are unable to diffuse through a phospholipid bilayer regardless of size; even H+ ions cannot cross a lipid bilayer by free diffusion.

Detailed explanation-2: -Some of these ways are active transport, passive transport, osmosis, and diffusion.

Detailed explanation-3: -Moving things in and out of the cell is an important role of the plasma membrane. It controls everything that enters and leaves the cell. There are two basic ways that substances can cross the plasma membrane: passive transport, which requires no energy; and active transport, which requires energy.

Detailed explanation-4: -Diffusion, osmosis and active transport are three main ways that molecules and ions can move into and out of cells through the membrane.