AP BIOLOGY

Detailed explanation-1: -Diffusion is the movement of molecules from a region of its higher concentration to a region of its lower concentration. It does not need a semi-permeable membrane to happen. A semi permeable membrane is required for the process of osmosis to happen.

Detailed explanation-2: -Osmosis only occurs when a semi-permeable membrane is present, but diffusion can happen whether or not it is present.

Detailed explanation-3: -This is a passive process, which means it does not need energy. The oxygen diffuses across the partially permeable membrane of the alveoli cells and the capillary wall, into the red blood cells to be carried around the body.

Detailed explanation-4: -In biology, a simple diffusion is a form of diffusion that does not require the assistance of membrane proteins. In essence, the particle or substance moves from higher to lower concentration. However, its movement does not need a membrane protein that will help substances to move downhill.

Detailed explanation-5: -Membrane Transport The transport of water and other types of molecules across membranes is the key to many processes in living organisms. Many of these transport processes proceed by diffusion through membranes which are selectively permeable, allowing small molecules to pass but blocking larger ones.