The fluid mosaic model of cell membranes – Primrose Kitten

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The fluid mosaic model of cell membranes

Last updated: 07/07/2020

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Question 1 of 19

1. Question
Which of the following is not a component found in cell membranes?
- Nucleic acid
- Phospholipid
- Cholesterol
- Glycoprotein
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Question 2 of 19

2. Question
Cell membranes are made out of how many layers of phospholipid?
- 2
- 1
- 4
- 3
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Question 3 of 19

3. Question
Which of the following is not a function of phosphopilids in a membrane?
- Form water-filled tubes to allow water-soluble substances to enter and leave the cell
- Allow lipid-soluble substances to enter and leave the cell
- Prevent water-soluble substances entering or leaving the cell
- Make the membrane flexible and self-sealing
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Question 4 of 19

4. Question
Which of the following does not describe a type of membrane protein?
- A protein that crosses the bilayer through a channel
- A protein associated with the surface of the bilayer
- A protein embedded in one leaflet of the bilayer
- A protein extending completely across the bilayer
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Question 5 of 19

5. Question
A protein channel is best described by which of the following?
- A water-filled tube which allows water-soluble ions and molecules to diffuse across the membrane
- A protein that binds to ions or molecules and changes shape to move them across the membrane.
- A protein associated with the surface of the bilayer
- A protein that crosses the bilayer through a channel
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Question 6 of 19

6. Question
Carrier proteins are best described by which of the following?
- A protein that binds to ions or molecules and changes shape to move them across the membrane.
- A water-filled tube which allows water-soluble ions and molecules to diffuse across the membrane
- A protein associated with the surface of the bilayer
- A protein that crosses the bilayer through a channel
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Question 7 of 19

7. Question
Which of the following is not a function for proteins attached to the surface of the bilayer?
- Moving water-soluble compunds across the membrane
- Providing mechanical support
- Acting as receptors for molecules such as hormones
- Binding cells together to form tissues
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Question 8 of 19

8. Question
Which of the following best describes cholesterol?
- An amphipathic molecule that adds strength to membranes
- A very hydrophilic molecule that adds strength to membranes
- A transmembrane protein which creates channels
- A type of lipid that has been modified by the covalent attachment of carbohydrate
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Question 9 of 19

9. Question
Which is not a function of cholesterol?
- Help adhere cells together
- Reduce lateral movement of other molecules in the membrane
- Make the membrane less fluid at high temperatures
- Prevent leakage of water and ions through from the cell
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Question 10 of 19

10. Question
Cholesterol interacts with what to limit lateral movement in the membrane?
- Fatty acid 'tails' of phospholipids
- Phosphate head groups of phospholipids
- Carbohydrate chains attached to extrinsic proteins
- Carbohydrate chains attached to lipids
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Question 11 of 19

11. Question
Lipids modified by the covalent attachment of a carbohydrate are known as what?
- Glycolipids
- Glycoproteins
- Glucolipids
- Lipoglycans
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Question 12 of 19

12. Question
In glycolipids, where is the carbohydrate chain located?
- It extends from the surface of the bilayer out into the watery environment
- It embeds into the membrane, crossing both halves of the bilayer
- It threads through one half of the bilayer
- It lays flat along the surface of the membrane
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Question 13 of 19

13. Question
Which of the following is not a function of glycolipids?
- To facilitate active transport of solutes across the membrane
- To act as recognition sites
- To help maintain the stability of the membrane
- To help cells adhere to one another to form tissues
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Question 14 of 19

14. Question
Proteins modified by the covalent attachment of a carbohydrate are known as what?
- Glycoproteins
- Glycolipids
- Glucoproteins
- Polysacchareins
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Question 15 of 19

15. Question
Which of the following is not a function of glycolipids?
- To make the membrane less fluid at high temperatures
- To act as recognition sites
- To allow cell recognition
- To help cells adhere to one another to form tissues
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Question 16 of 19

16. Question
Which of the following is not a function of a membrane within a cell?
- To store and transmit heredity information
- Provide an internal transport system
- Control entry and exit of materials into organelles
- Isolate enzymes that might damage the cell
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Question 17 of 19

17. Question
Which of the following is not a reason why a protein might not be able to cross a membrane?
- It is small and lipid soluble
- It is not soluble in lipid and so cannot cross the phospholipid bilayer
- It is too large to pass through a protein channel
- It shares the same charge as a protein channel and so is repelled
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Question 18 of 19

18. Question
The way in which components are arranged in membranes is known was what?
- The fluid-mosaic model
- The fluid-retention model
- The lipid raft model
- The fluid-membrane model
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Question 19 of 19

19. Question
In the fluid-mosaic model, the term fluid refers to what?
- That individual phospholipid molecules can move releative to one another creating flexible structure
- That the membrane is water and lipid soluble and can be dissolved in a range of fluids
- That the membrane contains channels through which fluids can flow
- That the membrane is impermeable and prevents fluids from flowing from one side to the other
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