Question

1. passive or active transport (8 points)

☑ endocytosis a. passive
b. active
☑ exocytosis
☑ simple diffusion
☑ osmosis
☑ facilitated diffusion
☑ sodium potassium pump
☑ pinocytosis
☑ phagocytosis

Explanation:

• Endocytosis: Requires energy (ATP) to bring substances into the cell, so it's active transport (b).
• Exocytosis: Also requires energy to release substances from the cell, active transport (b).
• Simple diffusion: Moves down concentration gradient, no energy, passive (a).
• Osmosis: Diffusion of water down concentration gradient, passive (a).
• Facilitated diffusion: Uses transport proteins, moves down gradient, no energy, passive (a).
• Sodium - potassium pump: Uses ATP to move ions against gradient, active (b).
• Pinocytosis: Type of endocytosis, requires energy, active (b).
• Phagocytosis: Type of endocytosis, requires energy, active (b).

Answer:

• endocytosis: b. active
• exocytosis: b. active
• simple diffusion: a. passive
• osmosis: a. passive
• facilitated diffusion: a. passive
• sodium potassium pump: b. active
• pinocytosis: b. active
• phagocytosis: b. active