Active Transport
Active transport…
TASK -Use the boxes below to complete the diagram above.
Molecules to be transported
across the membrane
Molecules can only be
transported in one direction
only- against their diffusion
gradient
Inside the cell
Carrier proteins are found in
the cell membrane
Outside the cell
Energy from respiration is
used to change the shape of
the carrier protein
The carrier protein is
changed back to its original
shape
The molecule is released on
the other side of the
membrane
Cell membrane