Diagram showing the inside of a cell and outside of a cell. There is a protein pump providing a path through the cell membrane. There are three particles outside the cell and fifteen particles inside the cell. There is a single particle approaching the protein pump and a jagged arrow labeled Energy.
What type of cell transport is modeled?
a
The model illustrates diffusion because solute particles are moving from an area of higher concentration to an area of lower concentration.
b
The model illustrates osmosis because water molecules are moving from an area of higher concentration to an area of lower concentration.
c
The model illustrates facilitated diffusion because protein channels allow solute particles to cross the cell membrane.
d
The model illustrates active transport because energy is required for solute particles to cross the cell membrane.
1 answer
The correct answer is:
d. The model illustrates active transport because energy is required for solute particles to cross the cell membrane.
This is indicated by the presence of the "Energy" label and the fact that solute particles are being transported against their concentration gradient (from lower concentration outside the cell to higher concentration inside the cell). Active transport requires energy, typically in the form of ATP, to move substances across a cell membrane.
