A Level biology – Osmosis – Primrose Kitten

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A Level biology – Osmosis

Last updated: 07/07/2020

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Question 1 of 22

1. Question
During osmosis…
- Water moves from an area of higher water potential to lower water potential
- Solutes move from an area of higher concentration to lower concentration
- Solutes move from an area of lower concentration to higher concentration
- Water moves from an area of lower water potential to higher water potential
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Question 2 of 22

2. Question
Which are not both passive processes?
- Osmosis and cotransport
- Facilitated diffusion and simple diffusion
- Osmosis and simple diffusion
- Osmosis and facilitated diffusion
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Question 3 of 22

3. Question
Which process causes turgor pressure to maintain plant rigidity?
- Osmosis
- Simple diffusion
- Facilitated diffusion
- Cotransport
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Question 4 of 22

4. Question
Red blood cells have been put in a solution under a microscope slide and appear shrivelled. This means that, compared to the cells, the solution is:
- Hypertonic
- Isotonic
- Hypotonic
- Can't tell
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Question 5 of 22

5. Question
Why can water not pass through the lipid bilayer of the cell surface membrane?
- The middle of the lipid bilayer is hydrophobic
- Water molecules are too large
- They are too small to cross
- The head of the phospholipid blocks them
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Question 6 of 22

6. Question
A red blood cell bursts when placed in a solution. Compared to the red blood cell, the solution must…
- Have a higher water potential
- Be hypertonic
- Have a higher concentration of ions
- Be warmer
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Question 7 of 22

7. Question
The passage of water from a region of higher water potential to a region of lower water potential through a selectively permeable membrane is known as what?
- Osmosis
- Simple diffusion
- Facilitated diffusion
- Cotransport
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Question 8 of 22

8. Question
During osmosis water moves from a region of higher water potential to a region of lower water potential through what?
- A selectively permeable membrane
- A region of medium water potential
- An impermeable barrier
- A freely permeable mesh
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Question 9 of 22

9. Question
Which of the following is a selectively permable membrane? 1. The cell surface membrane 2. The ER membrane 3. Mitochondial outer membrane
- They all are
- 1 only
- 1 and 2
- 2 and 3
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Question 10 of 22

10. Question
What is the best description of a solute?
- Any substance disolved in a solvent
- Any substance that can be disolved in water
- Ionic substances disolved in solution
- A type of liquid into which things can be disolved
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Question 11 of 22

11. Question
Which greek symbol is used to represent water potential?
- Ψ (Psi)
- Ω (Omega)
- Δ (Delta)
- Φ (Phi)
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Question 12 of 22

12. Question
What units is water potential measured in?
- kilopascal
- kilowatt
- kilojoule
- kilocalorie
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Question 13 of 22

13. Question
Under standard conditions, what is the water potential of pure water?
- 0 kPa
- 100 kPa
- -100 kPa
- – 273.15 kPa
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Question 14 of 22

14. Question
The addition of a solute to pure water will have what effect on the water potential?
- Lower it
- Raise it
- Make it variable
- No effect
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Question 15 of 22

15. Question
If a region has a water potential of -50 kPa, its water content will move towards which of the following regions by osmosis?
- – 100 kPa
- – 50 kPa
- -25 kPa
- 0 kPa
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Question 16 of 22

16. Question
Which is true of a tissue whose water potential is -20 kPa when placed in a solution with a water potential of -21 kPa
- There will be movement of water from the tissue into the solution by osmosis
- There will be movement of water from the solution into the tissue by osmosis
- The difference in water pressure is so small that there will be no osmosis
- There will be no movement of water as the cell membrane surrounding the tissue is impermeable
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Question 17 of 22

17. Question
What happens when the water potential on either side of a semi-permeable membrane achieves equilibrium?
- There is no net movement of water
- Water molecules cannot pass through the membrane anymore
- The amount of solute on either side of the membrane is now equal
- The solute molecules block up all of the pores in the membrane
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Question 18 of 22

18. Question
What is the highest possible value for water potential?
- 0 kPa
- 100 kPa
- -100 kPa
- – 273.15 kPa
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Question 19 of 22

19. Question
What happens when red blood cells are placed into pure water?
- They burst owing to the influx of water molecules
- They shrivel owing to the flow of water molecules into the solution
- They burst owing to the rapid flow of solute molecules across the cell membrane
- They swell up like balloons until they reach equilibrium
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Question 20 of 22

20. Question
What can we infer about the water potential of red blood cells from the fact they burst when put in pure water?
- That it is lower
- That it is higher
- That it is positive
- That it is unaffected by pure water
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Question 21 of 22

21. Question
What happens to plant cells when they are placed in pure water?
- They swell up
- They burst
- They shrivel
- There is no change
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Question 22 of 22

22. Question
Why doesn’t a plant cell burst when placed in pure water?
- The cell wall provides resistance against expansion and thus entry of further water molecules
- The water potential in the plant cell reaches equilibrium with the exterior
- The cell wall becomes impermeable
- Plant cells have a higher water potential than pure water
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