A Level Biology Triglycerides and phospholipids

Last updated: 16/02/2022

AQA A-Level Biology Lipids A Level Biology Triglycerides and phospholipids

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Question 1 of 22

1. Question
Which lipids are made of one molecule of glycerol and three molecules of fatty acid?
- Triglycerides
- Biglycerides
- Phospholipids
- Steroids
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Question 2 of 22

2. Question
The R-group of a fatty acid may be saturated or unsaturated. What does unsaturated mean?
- Some carbon atoms are linked by double or triple bonds
- All carbon atoms are linked by single bonds
- All carbon atoms are hydrolysed
- Some carbon atoms are oxidized
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Question 3 of 22

3. Question
Which of the following describes triglycerides best?
- Hydrophobic and insoluble
- Hydrophobic and soluble
- Hydrophilic and insoluble
- Hydrophilic and soluble
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Question 4 of 22

4. Question
What is the name of the functional group at the end of the chain in fatty acids?
- Carboxyl group (-COOH)
- Hydroxyl group (-OH)
- Aldehyde group (CHO)
- Methyl group (-CH3)
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Question 5 of 22

5. Question
What type of reaction occurs between glycerol and three molecules of fatty acid (RCOOH)?
- Condensation
- Reduction
- Hydrolysis
- Oxidation
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Question 6 of 22

6. Question
If a single double bond is present in a fatty acid it is…?
- Mono-unsaturated
- Poly-unsaturated
- Mono-saturated
- Poly-saturated
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Question 7 of 22

7. Question
What type of bond forms between one molecule of glycerol and three molecules of fatty acids?
- Ester bond
- Glycosidic bond
- Peptide bond
- Hydrogen bond
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Question 8 of 22

8. Question
Double bonds leading to bending of polyunsaturated triglycerides make them more likely occupy what state at room temperature?
- Liquid
- Solid
- Gas
- Plasma
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Question 9 of 22

9. Question
Which property makes triglycerides an excellent source of energy?
- High ratio of carbon-hydrogen bonds to carbon atoms
- Insoluble in water
- High ratio of hydrogen to oxygen atoms
- Potential to be mono- or poly-saturated
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Question 10 of 22

10. Question
Which property makes triglycerides an excellent source of energy?
- Low mass to energy ratio
- Potential to be mono- or poly-saturated
- Being osmotically inert
- Being a solid at room temperature
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Question 11 of 22

11. Question
In phospholipids, one of the fatty acids of a triglyceride is substituted by what?
- Phosphate-containing group
- Unsaturated, long-chain fatty acid
- Glycerol
- Glucose
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Question 12 of 22

12. Question
Which part of the phospholipid is hydrophobic?
- Fatty acid 'tail'
- Phosphate 'head'
- Peptide 'shoulder'
- Monosaccharide 'elbow'
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Question 13 of 22

13. Question
Which part of the phospholipid orientates itself away from water?
- Fatty acid 'tail'
- Phosphate 'head'
- Peptide 'shoulder'
- Monosaccharide 'elbow'
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Question 14 of 22

14. Question
Which of the following options is incorrect: The hydrophobic part of phospholipids can consist of…
- Both saturated and unsaturated fatty acids
- Saturated fatty acids only
- Unsaturated fatty acids only
- Neither saturated or unsaturated fatty acids
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Question 15 of 22

15. Question
Which part of the phospholipid is hydrophilic?
- Phosphate 'head'
- Fatty acid 'tail'
- Peptide 'shoulder'
- Monosaccharide 'elbow'
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Question 16 of 22

16. Question
Why are fatty acids said to be ‘polar’ molecules?
- They have a hydrophilic head and a hydrophobic tail
- They have a hydrophobic head and a hydrophilic tail
- They have frozen 'poles' at each end
- They are magnetic
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Question 17 of 22

17. Question
Owing to their polarity, in aqueous environments phospholipids form what structure important for formation of a cell?
- Bilayer
- Monolayer
- Trilayer
- Bipole
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Question 18 of 22

18. Question
Which of the following does not describe a property of a phospholipid bilayer?
- It forms a hydrophilic barrier between the inside and outside of the cell
- It forms a hydrophobic barrier between the inside and the outside of the cell
- It forms a barrier to separate the contents of organelles from the rest of the cell
- It forms vesicles to allow movement of proteins between different organelles
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Question 19 of 22

19. Question
By combining with carbohydrates within the cell-surface membrane, phospholipids form what type of molecules?
- Glycolipids
- Glycoproteins
- Steroids
- Lipoproteins
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Question 20 of 22

20. Question
Glycolipids have important functions in which process?
- Cell recognition
- DNA replication
- Cytokinesis
- Translation
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Question 21 of 22

21. Question
What is the appropriate scientific term to describe ‘water-loving’?
- Hydrophilic
- Hydrophobic
- Hydroponic
- Hydrophonic
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Question 22 of 22

22. Question
What is the appropriate scientific term to describe ‘water-hating’?
- Hydrophobic
- Hydrophilic
- Hydroponic
- Hydrophonic
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