Question

3.1.9 - 12c - transport
3.1.9 - 12c
the illustration shows a model of the transport of solute particles from outside the cell to inside
the cell.
what type of cell transport is modeled?
the model illustrates osmosis because water molecules 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 diffusion because solute particles are moving from an area of higher concentration to an area of lower
concentration.
the model illustrates active transport because energy is required for solute particles to cross the cell membrane.

Explanation:

To determine the type of cell transport, we analyze the model:

1. Osmosis involves water movement, but the model shows solute particles, so the first option is incorrect.
2. Facilitated diffusion is passive (no energy) and moves from high to low concentration. Here, solute moves from low (outside) to high (inside) concentration, so the second option is incorrect.
3. Diffusion moves from high to low concentration, but the model shows movement against the concentration gradient (low to high), so the third option is incorrect.
4. Active transport requires energy (shown as "Energy" in the model) and moves solute from low to high concentration (against the gradient), which matches the model.

Answer:

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