1. Concentration gradient
Active Transport
Gr C: Explain what active transport is.
Gr B:Model the stages in active transport and phagocytosis.
Gr A:Compare active transport with diffusion and osmosis.
Starter
Key Words
Active transport
Carrier protein
Energy
Concentration gradient
Diffusion
Osmosis
Phagocytosis
Starter
Explain why the plant cell changes shape when it is placed in a hypotonic solution and a hypertonic solution. Try and use the words “Flaccid” and “Turgid”

2. Key Words
Active Transport
Active transport is a method by which particles can cross a membrane, even against a concentration gradient, with the input of energy.
ENERGY
High Concentration
Low Concentration

3. Concentration Gradient Movement.
DON’T COPY THIS DOWN
Active
Transport
Diffusion
Osmosis

4. Concentration Gradient Movement.
Learning Activity
Osmosis
Draw each concentration gradient in your books. The attempt to compete each one.
(3 minute task)
Active
Transport
Diffusion

5. Concentration Gradient Movement.
Self assessment
Check your answers
Concentration Gradient Movement.
Osmosis
Active
Transport
Diffusion

6. Concentration gradient
Active Transport
Gr C: Explain what active transport is.
Gr B:Model the stages in active transport and phagocytosis.
Gr A:Compare active transport with diffusion and osmosis.
Starter
Key Words
Active transport
Carrier protein
Energy
Concentration gradient
Diffusion
Osmosis
Phagocytosis
Starter
Explain why the plant cell changes shape when it is placed in a hypotonic solution and a hypertonic solution. Try and use the words “Flaccid” and “Turgid”

7. Stages in Active Transport
1) Protein molecules move into the carrier protein and are recognized by the carrier protein.
Stages in Active Transport
2) The carrier protein is supplied with energy to drive protein across membrane.
Carrier protein
Energy
3) Once across membrane, carrier protein releases protein into the cell.
4) Finally the, carrier protein then returns to original position.
Inside of cell Outside of cell

8. Active Transport Learning Activity
Attempt the active transport worksheet. Can you place all of the labels into the correct place?
Molecules can only be transported in one direction only- against their diffusion gradient
Molecules to be transported across the membrane
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
Inside the cell
Carrier proteins are found in the cell membrane
Outside the cell
Cell membrane

9.
Still having trouble?
Try this Youtube clip and se whether we can clear up those misconceptions.

10. Using a different colour pen, go through your partners work and check that their notes contain all of these key pieces of information. If they're missing anything get them to write it down!
Check my notes
Active transport is the movement of molecules across a cell membrane from an area of low concentration to an area of high concentration.
Active transport works the opposite way to osmosis and diffusion.
Active transport requires carrier proteins to move molecules across the cell membrane.
Active transport requires energy to take place.
Each carrier protein is specific to a molecule. Meaning the cell is made up of hundreds of different carrier proteins.

11. Concentration gradient
Active Transport
Gr C: Explain what active transport is.
Gr B:Model the stages in active transport and phagocytosis.
Gr A:Compare active transport with diffusion and osmosis.
Starter
Key Words
Active transport
Carrier protein
Energy
Concentration gradient
Diffusion
Osmosis
Phagocytosis
Starter
Explain why the plant cell changes shape when it is placed in a hypotonic solution and a hypertonic solution. Try and use the words “Flaccid” and “Turgid”

12. Active Transport
Gr A:Compare active transport with diffusion and osmosis.
Learning Activity
Diffusion, osmosis and active transport all have different features, but they also have some the same.
Place each feature in the correct box. Think about whether any features overlap between two of the processes.

13. Place these features in the correct part of the Venn Diagram
Osmosis
Place these features in the correct part of the Venn Diagram
Involves water only
Requires energy
Is passive
Movement of particles
Needs a semi-permeable membrane
High to low concentration
Against a concentration gradient
Occurs in nature
How minerals get into root hair cells
How oxygen leaves a leaf
How water keeps plant cells turgid
Involves transport of solutes
Diffusion
Active Transport

14. Diffusion Osmosis Peer Assessment Active Transport
Involves water only
How oxygen leaves a leaf
Is passive
Check and correct your partners works. Count up how many they have in the right place and give them a round score and grade.
High to low concentration
How water keeps plant cells turgid
Movement of particles
Occurs in nature
Involves transport of solutes
Needs a semi-permeable membrane
Round Score
Requires energy
Grade
Score D 5 C 7 B 9 A 11
How minerals get into root hair cells
Against a concentration gradient
Active Transport

15. Concentration gradient
Active Transport
Gr C: Explain what active transport is.
Gr B:Model the stages in active transport and phagocytosis.
Gr A:Compare active transport with diffusion and osmosis.
Starter
Key Words
Active transport
Carrier protein
Energy
Concentration gradient
Diffusion
Osmosis
Phagocytosis
Starter
Explain why the plant cell changes shape when it is placed in a hypotonic solution and a hypertonic solution. Try and use the words “Flaccid” and “Turgid”

16. EXAM PLAY 7 marks 7 minutes
Grade C: Look at the table. Is it possible for the plant to take up sulfate ions by diffusion? Explain your answer (2)
Grade B: Describe two examples where osmosis is used in living things (2)
Grade A: Some scientists investigated the rates of absorption in the small intestine. In one experiment they used a piece of intestine poisoned by cyanide. Cyanide is poisonous because it prevents respiration. Explain why cyanide would prevent active transport occurring (3)
Concentration of sulfate ions in mmol per dm3
Roots of barley plants
1.4
Soil
0.15
No- As there are more ions in the root than the soil active transport would be needed (1) to transport them from a low to high concentration/ against the concentration gradient (1)
Root hair cells and mineral ions (1), glucose in the small intestine (2)
Active transport requires energy produced in respiration (1), in order to move the particles against the concentration gradient (1) by carrier proteins (1)