Question

what is the term for movement of molecules from an area of relatively lower to higher concentration that requires energy?

○ diffusion
○ active transport
○ osmosis
○ passive transport

Explanation:

• Diffusion is the movement of molecules from higher to lower concentration without energy.
• Osmosis is the diffusion of water across a semi - permeable membrane (higher to lower water concentration, no energy).
• Passive transport (like diffusion and facilitated diffusion) moves molecules down the concentration gradient (higher to lower) without energy.
• Active transport moves molecules against the concentration gradient (lower to higher) and requires energy (usually in the form of ATP).

Answer:

B. active transport