Question

directions: identify the processes occurring in the following pictures. then answer the follow up statement.
these three pictures are all examples of passive/active transport because these demonstrate movement along/against the concentration gradient which does/does not require energy.

Explanation:

• The first picture shows a cell engulfing a particle, which is phagocytosis (a form of endocytosis). Endocytosis is an active transport process as it requires energy (ATP) to form vesicles and move substances against the concentration gradient (if applicable in the context of moving substances into the cell when they might not naturally diffuse in).
• The second picture: If we assume 1 is exocytosis (vesicle fusing with the membrane to release contents), 2 is endocytosis (vesicle forming to take in substances), and 3 is a concentration gradient. Both endocytosis and exocytosis are active transport processes as they involve vesicle formation and movement of substances (often against a gradient or in a controlled manner that requires energy).
• The third picture shows movement from low to high concentration. Active transport moves substances against the concentration gradient and requires energy (e.g., ATP - powered pumps), while passive transport (like simple diffusion, facilitated diffusion) moves substances along the concentration gradient (from high to low) and does not require energy.

Answer:

All three pictures are examples of active transport. The first (phagocytosis - a type of endocytosis) requires energy to engulf particles. The second (endocytosis and exocytosis) involves vesicle - mediated transport which is energy - dependent. The third shows movement against the concentration gradient (a hallmark of active transport as passive transport moves along the gradient).