plumiDNA: AQA A‑Level Chemistry questions
AQA A-Level Chemistry past-paper questions on 3.3.13.4 DNA, 2008–2025, with mark schemes and examiner’s reports where available.
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All 12 questions on DNA, as a list
- November 2021, Paper 3, Q36 (1 mark): Which row shows a pair of bases that can link two strands of DNA with three hydrogen bonds? Use the Data Booklet to help you answer this question. [1 mark] Base
- June 2019, Paper 2, Q12.1 (2 marks): Draw all the hydrogen bonds between the complementary strands shown in Figure 4. Use dashed lines to show the hydrogen bonds. You do not need to show lone pairs
- June 2019, Paper 2, Q12.2 (2 marks): Draw a ring around each of the component parts that make up the cytosine nucleotide in the section of DNA shown in Figure 4. [2 marks]
- June 2019, Paper 2, Q12.3 (1 mark): State the meaning of the term complementary when it is used to refer to DNA strands. [1 mark]
- June 2019, Paper 3, Q30 (1 mark): Two strands of DNA are linked together by hydrogen bonding between bases on each strand. Which row shows the number of hydrogen bonds between the pair of bases?
- June 2018, Paper 2, Q09.1 (1 mark): Complete Table 4 to show the correct sequence of bases in the complementary strand represented by the numbers 1 to 5 [1 mark] Table 4 1 2 3 4 5
- June 2018, Paper 2, Q09.2 (1 mark): Deduce the total number of hydrogen bonds formed between the five bases in each strand. Tick () one box. [1 mark] 10 12 13 15
- June 2018, Paper 2, Q09.3 (2 marks): Base A is part of a nucleotide in the DNA strand shown in Figure 2. A nucleotide contains a 2-deoxyribose molecule. An incomplete 2-deoxyribose molecule is show
- June 2017, Paper 2, Q09.1 (2 marks): A deoxyribose molecule in a strand of DNA is shown. Name the types of group attached to 2-deoxyribose at positions X and Y. [2 marks X Y
- June 2017, Paper 2, Q09.2 (2 marks): In the DNA double helix, adenine is linked by hydrogen bonds to a molecule in the other strand of DNA. Complete the diagram below to show the other molecule and
- Specimen, Paper 2, Q08.1 (1 mark): 9
- Specimen, Paper 2, Q08.2 (4 marks): 0
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