AP BIOLOGY

Detailed explanation-1: -Simple diffusion does not require energy: facilitated diffusion requires a source of ATP.

Detailed explanation-2: -This type of diffusion proceeds without an input of energy. In simple diffusion, molecules that are small and uncharged can freely diffuse across a cell membrane. They simply flow through the cell membrane. Simple diffusion does not require energy or need the assistance of a transport protein.

Detailed explanation-3: -Final answer: Active transport requires energy in the form of ATP.

Detailed explanation-4: -Being passive, facilitated transport does not directly require chemical energy from ATP hydrolysis in the transport step itself; rather, molecules and ions move down their concentration gradient reflecting its diffusive nature.

Detailed explanation-5: -Yes, active transport can only be achieved with the help of ATP or Adenosine Triphosphate. Active transport refers to the movement of molecules from an area of lower concentration to an area of higher concentration. This movement against the concentration gradient cannot be achieved without some type of energy.