A Level Biology – The Cell membrane

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A Level Biology – The Cell membrane

Last updated: 09/12/2020

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Question 1 of 22

1. Question
What is the name given to the theory of cell membranes with proteins embedded in a sea of phospholipids?
- Fluid mosaic model
- Phospholipid bilayer
- Plasma membrane
- Mosaic membrane
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Question 2 of 22

2. Question
Why are some membranes referred to as partially permeable?
- Because they do not allow all particles through
- Because they only allow uncharged particles through
- Because they allow all substances through
- Because they only allow lipids through
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Question 3 of 22

3. Question
Which of these is not a role of the plasma membrane?
- Conducts electrical impulses
- Contains enzymes involved in specific metabolic pathways
- Regulate transport of materials in and out of cell
- Release signaling molecules
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Question 4 of 22

4. Question
Why must cell surface membranes have antigens
- So the cell is recognised as ‘self’ by immune system
- To fight pathogens trying to invade the cell
- To attack to neighbouring cells to form tissue
- So the cell is recognised as an organelle
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Question 5 of 22

5. Question
What is the name given to the folded inner membranes in the mitochondria?
- Cristae
- Stroma
- Thylakoids
- Matrix
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Question 6 of 22

6. Question
What is the name given to the inner membranes in the chloroplast?
- Thylakoid
- Matrix
- Stroma
- Cristae
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Question 7 of 22

7. Question
Of which process may some reactions of occur on the inner membranes of the chloroplasts?
- Photosynthesis
- Respiration
- Ammonification
- Phagocytosis
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Question 8 of 22

8. Question
In which cell’s plasma membranes, found in the small intestines, may have digestive enzymes present?
- Epithelial
- Nerve
- Hepatic
- Endothelial
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Question 9 of 22

9. Question
What is a glycoprotein?
- A carbohydrate chain attached to a protein molecule
- A fatty acid tail attached to a glycerol molecule
- A fatty acid tail attached to a protein molecule
- A carbohydrate chain attached to a glycerol molecule
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Question 10 of 22

10. Question
What is a glycolipid
- A carbohydrate chain attached to a lipid
- A carbohydrate chain attached to a glycerol molecule
- A fatty acid chain attached to a glycerol molecule
- A fatty acid chain attached to a protein molecule
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Question 11 of 22

11. Question
Which of these characteristics is given to a membrane from a cholesterol molecule?
- Flexibility
- Ridgity
- Solubility
- Permeability
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Question 12 of 22

12. Question
What forms the glycocalyx?
- The carbohydrate chains attached to lipids and proteins
- The integral proteins attached to the phospholipids
- The tails of the phospholipid bilayer
- The fatty acid chains attached to the lipid molecules
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Question 13 of 22

13. Question
What is required in the plasma membrane of neurones to bring about the conduction of electrical impulses?
- Protein channels
- Glycolipids
- Cholesterol
- Enzymes
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Question 14 of 22

14. Question
What is found wrapped round neurones to give them several layers of membrane?
- Myelin sheath
- Enzymes
- Cholesterol
- Cytokines
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Question 15 of 22

15. Question
What do root hair cells have many of to actively transport nitrate ions?
- Carrier proteins
- Phospholipids
- Receptors
- Cholesterol
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Question 16 of 22

16. Question
What is an impulse carried along in a neurone?
- The axon
- The synapse
- The dendrites
- The cell body
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Question 17 of 22

17. Question
What enzymes are found in the inner membranes of mitochondria?
- ATPase
- Trypsin
- Deoxyribonuclease
- Lipase
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Question 18 of 22

18. Question
Which of these is not a function of membranes within cells?
- To provide mechanical strength to the cell
- Control the entry and Exits of materials
- Provide an internal transport system
- Isolate enzymes that might damage the cell
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Question 19 of 22

19. Question
Which of these is not a reason why most molecules can’t freely pass through the plasma membrane?
- Molecules are non-polar
- Not soluble in lipids
- Too large to pass through protein channels in the membrane
- Molecules are polar
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Question 20 of 22

20. Question
Which of these is not a function of glycoproteins in the membrane?
- Provide structural support
- Act as recognition sites
- Helps cells attach to each other to form tissues
- Allows lymphocytes to recognise cells as the organisms own cells
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Question 21 of 22

21. Question
Which of these is not a function of cholesterol in the membrane?
- Provide an internal transport system
- Reduce lateral movement of other molecules
- Make the membrane less fluid at higher temperatures
- To prevent leakage
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Question 22 of 22

22. Question
What component of the plasma membrane allows lipid soluble substances to enter and leave the cell?
- Phospholipids
- Cholesterol
- Protein channels
- Proteins
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