AP BIOLOGY

Detailed explanation-1: -In simple diffusion, small noncharged molecules or lipid soluble molecules pass between the phospholipids to enter or leave the cell, moving from areas of high concentration to areas of low concentration (they move down their concentration gradient).

Detailed explanation-2: -It occurs when molecules such as glucose or amino acids move from high concentration to low concentration facilitated by carrier proteins or pores in the membrane.

Detailed explanation-3: -Gases, hydrophobic molecules, and small polar uncharged molecules can diffuse through phospholipid bilayers.

Detailed explanation-4: -In osmosis, water moves from areas of low concentration of solute to areas of high concentration of solute.