Question

which of the following requires energy (in the form of atp)?
simple diffusion
osmosis
facilitated diffusion
endo - or exo - cytosis

Explanation:

• Simple diffusion is the movement of molecules from an area of higher concentration to an area of lower concentration. It occurs due to the random motion of molecules and does not require energy.
• Osmosis is the diffusion of water across a selectively - permeable membrane. It also occurs down the concentration gradient of water and does not need energy.
• Facilitated diffusion is the movement of molecules (usually polar or large non - polar molecules) across a membrane with the help of transport proteins. This movement is still along the concentration gradient and does not require energy.
• Endocytosis is the process of taking in large particles or fluids by the cell, and exocytosis is the process of expelling substances from the cell. These processes involve the formation and fusion of vesicles, and they require energy in the form of ATP.

Answer:

Endo - or Exo - cytosis