A Level Biology – Transport across internal and external membranes – Primrose Kitten

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A Level Biology – Transport across internal and external membranes

Last updated: 09/12/2020

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Question 1 of 23

1. Question
What is the name given to part A?
- Phospholipid bilayer
- Phospholipid monolayer
- Plasma membrane
- Lipid bilayer
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Question 2 of 23

2. Question
What type of substance can pass through part A?
- Lipid soluble, small, non-polar
- Anything
- Large, polar
- Water soluble
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Question 3 of 23

3. Question
What is the mode of transport where molecules pass straight through the phospholipid bilayer?
- Simple diffusion
- Facilitated diffusion
- Active transport
- Co-transport
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Question 4 of 23

4. Question
Name part B…
- Channel protein
- Glycoprotein
- Carrier protein
- Phospholipid
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Question 5 of 23

5. Question
What is the main mode of transport when molecules pass through part B?
- Facilitated diffusion
- Simple diffusion
- Co-transport
- Co-transport
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Question 6 of 23

6. Question
Name part C…
- Carrier protein
- Channel protein
- Glycolipid
- Glycoprotein
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Question 7 of 23

7. Question
What is the main mode of transport that can occur in part C?
- Active transport
- Facilitated diffusion
- Co-transport
- Simple diffusion
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Question 8 of 23

8. Question
How do molecules enter/leave a cell via carrier proteins?
- By causing a change in tertiary structure upon binding.
- By changing the quaternary structure upon binding.
- By changing the primary structure upon binding.
- By changing the secondary structure upon binding.
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Question 9 of 23

9. Question
What is the term given to describe the entire plasma membrane?
- Fluid-mosaic model
- Crystalline lattice
- Rigid-mosaic model
- Fluid regulated model
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Question 10 of 23

10. Question
What does the term “fluid” in “fluid-mosaic model” indicate?
- Molecules can flow freely
- There is lots of liquid present
- The membrane is unstable
- There are lots of molecules present
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Question 11 of 23

11. Question
What does the term “mosaic” in “fluid-mosaic model” indicate?
- Many types of molecule are present
- The membrane is very organised
- The membrane is pleasing to look at under a microscope
- The membrane isn't very complex
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Question 12 of 23

12. Question
Name part D
- Cholestrol
- Glycoprotein
- Glycolipid
- Phospholipid
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Question 13 of 23

13. Question
What is the role of part D?
- Restricts movement to provide stability.
- To facilitate absorption of molecules through the membrane.
- Encourage movement to decrease stability.
- Doesn't have any significant role.
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Question 14 of 23

14. Question
Name part E
- Glycoprotein
- Glycolipid
- Phospholipid
- Cholesterol
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Question 15 of 23

15. Question
Name part F
- Glycolipid
- Glycoprotein
- Phospholipid
- Cholesterol
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Question 16 of 23

16. Question
What is the main function of both parts E and F?
- Cell attachment
- Catalytic functions
- No significant role
- To stabilise the proteins embedded in the membrane
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Question 17 of 23

17. Question
What is active transport?
- Movement against concentration gradient
- Movement down concentration gradient
- Movement against pressure gradient
- Movement down pressure gradient
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Question 18 of 23

18. Question
What process provides energy for active transport?
- ATP hydrolysis
- ATP synthesis
- Glucose oxidation
- Glucose reduction
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Question 19 of 23

19. Question
What is meant by co-transport?
- Transport of 2 molecules, one down and one against its conc gradient
- Transport of 2 molecules, both going down a conc gradient
- Transport of 2 molecules, both going against a conc gradient
- Transport of many molecules down a pressure gradient
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Question 20 of 23

20. Question
When glucose is absorbed via the small intestine, which ion is transported along it into the epithelial cells?
- Sodium
- Potassium
- Phosphate
- Magnesium
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Question 21 of 23

21. Question
Why are potassium ions transported in, and sodium ions are transported out of the epithelial cells?
- To maintain a concentration gradient of sodium ions into the epithelium
- To prevent excess absorption of glucose into the blood
- To prevent a concentration gradient of sodium ions.
- To change the tertiary structure of the channel proteins
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Question 22 of 23

22. Question
What is meant by osmosis?
- Movement of water from a high to low water potential
- Movement of water from a low to high water potential
- Movement of water along a pressure gradient
- Movement of water against a pressure gradient
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Question 23 of 23

23. Question
What type of membrane does osmosis occur across?
- Semi-permeable
- Completely permeable
- Impermeable
- Doesn’t occur across a membrane
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