plumiLipids: OCR A‑Level Biology A questions
OCR A-Level Biology A past-paper questions on 2.1.2.4 Lipids, 2016–2025, with mark schemes and examiner’s reports where available.
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All 26 questions on Lipids, as a list
- June 2024, Paper 1, Q1 (1 mark): Which statement about lipids is correct? A Lipids are polar molecules. B Lipids that contain fatty acids with carbon–carbon double bonds are liquid at room temp
- June 2024, Paper 1, Q3 (1 mark): The diagram shows part of a plasma membrane. X How can molecule X be described? A It has a hydrophilic head and a hydrophobic tail. B It is formed when the glyc
- June 2024, AS Paper 1, Q10 (1 mark): The diagram shows a triglyceride molecule found in sunflower oil. O O O O O O Which option describes the structure of this triglyceride molecule? A Contains pho
- June 2024, AS Paper 2, Q6(b) (2 marks): Which statements about biological molecules are true and which are false? Tick (✓) one box in each row. Statement True False Breaking one ester bond in a trigly
- June 2023, Paper 1, Q2 (1 mark): Which statement about lipids is correct? A Phospholipids are formed by esterification of glycerol with three molecules of fatty acid. B Phospholipids containing
- June 2022, Paper 1, Q1 (1 mark): Which statement describes the properties or functions of cholesterol? A It increases the fluidity of the phospholipid bilayer at high temperatures. B It is an u
- June 2022, Paper 1, Q2 (1 mark): Which statement describes triglycerides? A They are broken down by condensation reactions. B They are polymers of glycerol and fatty acids. C They contain ester
- June 2022, AS Paper 1, Q20 (1 mark): An enzyme hydrolyses a phospholipid molecule to release a fatty acid. What is the name of the bond that is broken in this hydrolysis reaction? A Ester B Glycosi
- June 2022, AS Paper 2, Q3(b)(i) (1 mark): Describe how the structure of a polyunsaturated triglyceride molecule would differ from the molecule shown in Fig. 3.2. [1]
- June 2022, AS Paper 2, Q3(b)(ii) (3 marks): Hypercholesterolemia is a condition in which an individual has a high blood cholesterol level. Studies were carried out in the USA over several decades, looking
- November 2020, AS Paper 1, Q16 (1 mark): Oleic acid is a monounsaturated fatty acid found in vegetable oil. Which of the following, A to D, is the correct structure for oleic acid? A HO O B HO O C HO O
- November 2020, AS Paper 1, Q18 (1 mark): Human pancreatic lipase breaks the bonds between fatty acids and glycerol. What name is given to this reaction? A condensation B esterification C hydration D hy
- November 2020, AS Paper 2, Q2(c)(ii) (2 marks): The process of esterification leads to the formation of ester bonds during the production of triglycerides. Describe what is meant by the term esterification. [
- June 2019, Paper 2, Q21(a)(i) (2 marks): Calculate the number of phospholipid molecules in the outer surface of the lipoprotein shown in Fig. 21. Assume that the pattern of proteins and phospholipids s
- June 2019, Paper 2, Q21(a)(ii) (1 mark): Lipoproteins with fewer phospholipids and more protein in the outer layer are known as high density lipoproteins. Lipoproteins with a larger number of phospholi
- June 2019, Paper 2, Q21(b) (6 marks): Complete the passage by choosing the most appropriate word from the list. bile carbon hydrogen insoluble nitrogen oxygen permeability production solid soluble s
- June 2019, Paper 2, Q21(c) (2 marks): Triglycerides are a type of lipid molecule that can be broken down during hydrolysis reactions. Using the structure of triglyceride molecules as an example, exp
- June 2018, Paper 2, Q4 (1 mark): Which of the following processes involves the formation of ester bonds? 1 synthesis of polynucleotides 2 synthesis of triglycerides 3 synthesis of polypeptides
- June 2018, Paper 2, Q6 (1 mark): Lipids are a diverse group of chemicals that are neither polar nor charged and hence are insoluble in water. The ___(1)___ nature of the heads of phospholipids
- June 2018, Paper 2, Q22(a) (1 mark): Compound W shows some structural similarities with fatty acids. State one structural difference between compound W and a saturated fatty acid. [1]
- June 2018, AS Paper 1, Q22(a) (1 mark): On Fig. 22 circle an ester bond. [Answer on Fig. 22] [1]
- June 2018, AS Paper 1, Q22(b) (1 mark): Sunflower oil is used to make biodiesel, which contains methyl esters. The fatty acids in the triglyceride molecule are reacted with methanol in a process calle
- June 2018, AS Paper 1, Q22(c)(i) (3 marks): Name three other functions of triglycerides in living organisms. 1 2 3 [3]
- June 2018, AS Paper 1, Q22(c)(ii) (2 marks): Table 22 shows the melting points of some of the methyl esters made from the transesterification of sunflower oil fatty acids. Methyl ester Formula Melting poin
- June 2018, AS Paper 1, Q22(d) (2 marks): Phospholipid molecules also contain fatty acids. Explain how the fatty acids in phospholipids allow the formation of membranes. [2]
- June 2017, AS Paper 2, Q6(c)(i) (2 marks): State two ways in which the molecular structure of cholesterol is similar to the molecular structure of glucose. [2]
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