Question

question 15 which of the following are processes that are categorized as passive transport? select all that apply. a active transport b diffusion c osmosis d exocytosis e facilitated diffusion f endocytosis

Explanation:

• Diffusion: It is the movement of molecules from an area of higher concentration to an area of lower concentration. No energy (ATP) is required.
• Facilitated diffusion: Molecules (usually polar or large non - polar molecules) move across the membrane with the help of transport proteins (channel or carrier proteins). It still occurs down the concentration gradient and does not require energy.
• Osmosis: The diffusion of water molecules across a semi - permeable membrane from an area of lower solute concentration (higher water concentration) to an area of higher solute concentration (lower water concentration). No energy is needed.
• Active transport: Moves molecules against the concentration gradient (from low to high concentration) and requires energy (usually in the form of ATP).
• Endocytosis: The cell membrane engulfs substances (solid or liquid) to form vesicles inside the cell. It requires energy as it involves membrane movement and vesicle formation.
• Exocytosis: Vesicles fuse with the cell membrane to release substances outside the cell. It also requires energy for vesicle - membrane fusion and membrane re - organization.

Answer:

b. Diffusion, d. Facilitated diffusion, c. Osmosis