LIFE SCIENCE

Detailed explanation-1: -Passive diffusion is thus a nonselective process by which any molecule able to dissolve in the phospholipid bilayer is able to cross the plasma membrane and equilibrate between the inside and outside of the cell.

Detailed explanation-2: -Passive osmosis and diffusion Some substances (small molecules, ions) such as carbon dioxide (CO2) and oxygen (O2), can move across the plasma membrane by diffusion, which is a passive transport process.

Detailed explanation-3: -Small nonpolar molecules, such as O2 and CO2, are soluble in the lipid bilayer and therefore can readily cross cell membranes. Small uncharged polar molecules, such as H2O, also can diffuse through membranes, but larger uncharged polar molecules, such as glucose, cannot.

Detailed explanation-4: -Diffusion: If a molecule is very small, such as oxygen or carbon dioxide, diffusion does the trick. When the concentration of O2 outside the cell is higher than inside, O2 molecules diffuse in, passing through the membrane like it isn’t even there.