Question

inside of cell
protein pump
high concentration
energy
outside of cell
low concentration

the model illustrates active transport because energy is required for solute particles to cross the cell membrane.
the model illustrates diffusion because solute particles are moving from an area of higher concentration to an area of lower concentration
the model illustrates facilitated diffusion because protein channels allow solute particles to cross the cell membrane.
the model illustrates osmosis because water molecules are moving from an area of higher concentration to an area of lower concentration.

Explanation:

1. Analyze each option:

• Option 1: Active transport requires energy (ATP) and moves substances against their concentration gradient (from low to high concentration). The model shows energy use and movement from low (outside) to high (inside) concentration via a protein pump, so this matches active transport.
• Option 2: Diffusion is passive (no energy) and moves from high to low concentration. The model shows movement from low to high, so this is incorrect.
• Option 3: Facilitated diffusion is passive (no energy) and uses protein channels to move from high to low concentration. The model has energy use and movement against gradient, so incorrect.
• Option 4: Osmosis is the movement of water, but the model shows solute particles (not water) moving, so incorrect.

Answer:

The model illustrates active transport because energy is required for solute particles to cross the cell membrane.